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Illustrations and extensive description of the items listed below can be seen in Dennis Laney's definitive Leica 1984 Accessory Guide courtesy of Mike Butkus

Leica Code	Description	Production Year	Remarks
UASKU	18 x 24 mm format VIIIs slide projector	1936-1951	-
UBAFE	Picture slides for projectors with 5 x 5cm frame format	1932-1936	-
UBAHO	Slide attachment for small VIIIb projector with picture slide and 8 cm lens milar and condensor	1932-1936	-
UBAZU		19??-19??	-
UBEAF	30 volt / 100 watt Cinema lamp plug-in socket for slide projectors VIIIa and VIIIb	ca.1935	-
UBEBC		19??-19??	-
UBECD	22 mm extension tube for Focoslide and also for UDIMO enlarger using 5 cm Elmar	1936-1940	NY item
UBEHU		19??-19??	-
UBELA	Small projector with UDIMO film UKEDO intent with semi-automatic film guides and threaded socket for Leica lenses	ca.1935	-
UBELABIKU		19??-19??	-
UBELADOKO		19??-19??	-
UBEMI	100 watt lamp for Cinema use with slide projectors VIIIa and VIIIb	1932-19??	-
UBENO	Slide projector lamp housing for projector VIIIb with film intent UKEFI including lens milar	1932-1936	-
UBEOL		19??-19??	-
UBEPU		19??-19??	-
UBFKU		19??-19??	-
UBIKU	Projector VIIIa for lenses from 12 to 15 cm	1932-1936	-
UBILADAKI		19??-19??	-
UBIRN	Mirrored special 500 W bulb for 100 to 130 volts in 5 volt steps usd with IVb slide projector	19??-1932	-
UBMWU	Extra heat protection filter with 250 v socket for Prado slide projectors	ca.1955	-
UBODI	Slide projector VIIIb with lamp housing and picture slide intent UBAHO including lens milar	1932-1936	-
UBODIMAX		19??-19??	-
UBRGU		19??-19??	-
UBSIU		19??-19??	-
UBTLU		19??-19??	-
UCDEU		19??-19??	-
UCEGU	Pradovit I slide projector with Dimaron 2.8/100mm	1960	-
UCFIU		19??-19??	-
UCFKU	Pradovit I slide projector with Colorplan 2.5/90mm	1960	-
UCHRU	Protective metal hood for Pradovit I slide projector	1960	-
UCMVU		19??-19??	-
UCNXU	Pradovit f slide projector with Dimaron 2.8/100mm	1960	-
UCPBU		19??-19??	-
UCPLU	Pradovit f slide projector with Colorplan 2.5/90mm	1960	-
UCSHU	Remote control 4 m cable	1960	-
UCWQU	1960	-
UDAKI	Slide projector VIIIa to VIIIs for lenses 7.3, 8, 8.5 and 9 cm	1932-1936	-
UDALU	Image slide for 24 x 36 mm slides between 3.5 x 12 cm glass plates for type VIII slide projectors	1932-19??	-
UDAMY	Leica-film unit for Leica lenses on the non-Leica projectors with take-up spool, fire drums and film guide for 24 x 36 mm film slides	1932-1936	-
UDANO	VIIIa projector housing, similar to UDIMO, with UBAFE	19??-19??	-
UDANOBIKU		19??-19??	-
UDANODAKI		19??-19??	-
UDANODOKO		19??-19??	-
UDAOB	Projection milar f = 8 cm for VIIIa and similar slide projectors	1932-1936	-
UDAPA	Cassette with a circular cutout for 5 x 5 cm lantern slides for VIIIa and other slide projectors	1932-19??	-
UDAPTA		19??-19??	-
UDAVI		19??-19??	-
UDCBU	Pradovit f slide projector with Dimaron 2.8/150mm	1960	-
UDEJO	Small slide projector UDIMO (VIIIa) with UBAFE and UDAMY removable cassettes	1932-1936	-
UDGKU	Plywood case for projector plus accessories and 150mm lenses	1960	-
UDIAS	Diavorsatz with Lens Dimar 250mm and two alternating frames made of wood for 8.5 x 8.5, 8.5 x 10, 9 x 12 slides for the IVb L. slide projector	1932-19??	-
UDIMO	VIIIa slide projector, lamp housing with 100-watt lamp for mains cinema, reflector and cassette	1932-1936	-
UDKQU	Second heat protection filter, including 500-watt lamp	1960	-
UDLSU	1960	-
UDOKO	Condenser for small VIIIa projector including Elmar and Hektor 5 cm lenses	ca.1955	-
UDOYU	Prado 250 complete with 10 cm Dimaron projector lens	ca.1955	-
UDOZU	Front assembly for VIIIa and others slide projectors	1932-1936	-
UDREU	10 cm Hector lens for Prado 250 projector	19??-1955	-
UDRUK	Pressure switch for short connection cord to slide projector	1932-19??	-
UDUHS		19??-19??	-
UDWPU	Transparent container for 2 slide magazines	1960	-
UDXRU	Transparent containers with 2 magazines	1960	-
UEOOK	Adaptor ring for UZEOO 36 mm front lens mount	19??-19??	16568
UEOXU	Slide magazine for 30 slides	1960	-
UEPOO	Adaptor ring for UZEOO 42 mm front lens mount	19??-19??	16566
UFBXU	5 magazine cassette	1960	-
UFTGU	2 slide magazines for 50 slides incl. cardboard	1960	-
UGPXU	Remote control cable 10m long	1960	-
UGQZU	Remote control cable 15m long	1960	-
UGRBU	Remote control cable 20m long	1960	-
UHPWU	Multiple connector for tape device and cable	1960	-
UKGDU	Synchronous circuit with tape	1960	-
UMHDU	Pradovit f with Dimaron 2.8/100mm, at 60Hz switchable	1960	-
UMIQU	Pradovit f with Colorplan 2.5/90mm, at 60 Hz. switchable	1960	-
UMKHU	Pradovit f with Hektor 2.5/120mm, at 60 Hz. switchable	1960	-
UMLKU	Pradovit f with Dimaron 2.8/150mm, at 60 Hz. switchable	1960	-
UMNOU	Pradovit f with Hektor 2.5/150mm, at 60 Hz. switchable	1960	-
UNOOB	Carrying arm with lens holder and variable bellows, known as the lower stage of the universal reproduction apparatus for Elmar (I) f= 5 cm 1:3.5	1934-19??	-
UNOOB-YSMOO	Carrying arm with lens holder and variable bellows, known as the lower stage of the universal reproduction apparatus for Summar f= 5 cm 1:2	1937-19??	-
UOOND	Adapter ring used to mount Leica M lens and Viso II or Viso III accessories to Viso I or PLOOT reflex housings. It can also be used to mount M lens on screw mount extension tube or copy device like Focoslide for close-up work. The screw mount version is UUOYW	1956-19??	16596
UOOPE	Spannungsreduzierer with voltmeter to extend the life of AKTOO projector bulb	?	-
UOORE	Believed to be a typo for UOORF Forum discussion	?	-
UOORF	Adapter ring for the lens head of the rigid Summicron 50 with SOOKY or SOMKY Forum discussion [1]	1960	16508
UOOST	UOOYW + UOOVH	?	-
UOOVH	Lens adapter ring for the head of Hector and Elmar 135mm	?	16580
UOOWV	Lens Adapter Ring for heads and the Elmarit 90mm Elmar	?	16585
UOOXI	Adapter Ring Lens fü the head of the 125mm Hektor	1958	16572
UOOYW	Bellows connecting ring for I and II Fontenelle archive	?	16590 N
UOOZK	Adapter ring for the head of the Summicron 90 mm Forum discussion	1960	16598
UOSWU	Horizontal slider for Prado S and SM	?	-
UPOOZ	Yellow very light no. 0 filter; screw-on type E58	ca.1951	13235
UQMOO	Yellow light no. 1 filter; screw-on type E58	ca.1951	13235
UQOOY	Yellow medium no. 2 filter; screw-on type E58	ca.1951	-
UROOX	Panchromatic green filter; screw-on type E58	ca.1951	13245
USFLA	Kodachrome flash filter; type E58	1949-19??	NY item
USOAY	Kodachrome type A filter; type E58	1949-19??	NY item
USOOW	Orange filter; screw-on type E58	ca.1951	13250
USQOO	Infra-red light no. 1 filter; screw-on type E58	ca.1951	13255
USSKY	Kodachrome skylight filter; type E58	1954-19??	NY item
UTOOV	Infra-red medium no. 2 filter; screw-on type E58	ca.1951	-
UTSOO	Infra-red dark no. 3 filter; screw-on type E58	ca.1951	13265
UUOYW	Adapter ring used to mount screw-mount lens and Viso II or Viso III accessories to Viso I or PLOOT reflex housings. It can also be used for mounting extension tube or copy device like Focoslide for close-up work. The M-mount version is UUOND	1956-19??	-
UVOOF	UVa filter; screw-on type E58	ca.1951	13270
UVWOO	4-way lamp socket with cable and plug	1951-19??	16760
UWOOS	Arm connector for copy stand Focoslide	19??-19??	16601
UWYOO	Adaptor plate for using focusing bellows on carrying arms ROONP and ROOFU	1951-19??	16600
UXOOR	Universal focusing bellows; early version had smaller diameter thread for the lens mount and was supplied with an adaptor ring UOOYW and tube UOOVH for Hektor f= 13.5 cm 1:4.5 ; later version has thread for universal focusing bellows II with interchangable adaptor rings Forum discussion Fontenelle archive	1951-19??	16555 [2]
UYOOQ	Fiber case with Visoflex I, bellows and accessories	?	-
UZEOO	Large extending bellows lens hood with changeover mask frame for upright and horizontal shots for 36 mm front lens mount Forum discussion	1951-19??	16565
UZEOO-M	Bellows lens hood for 42 mm front lens mount	1960-19??	16567