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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
RAMET	Mask used with RASUK for 10.5 & 13.5 cm lenses	1933-19??	-
RASAL	RAMET + RASUK; for 10.5 & 13.5 cm lenses; black or chrome	1933-19??	-
RASUK	Folding viewfinder for 3.5, 5, 7.3 and 9 cm lenses; black or chrome	1933-19??	-
RDQOO	Reprovit II diaphragm operating lever and guide for lens on ROOXU	1951-19??	16775
REDIG-BEEUL	Resistor for 110 volt DC	19??-19??	-
REDUK-BEEUL	Resistor for 220 volt DC	19??-19??	-
REDYX	Regulating transformer for BEECH microscope light	1934-19??	-
REEOD	Universal Copying Device consisting of VAFOO, RESOO, STUOO, GROOW, ZWOOC, UNOOB, TBKOO, LOOCG, LOOFV, LOOGI, LOOHW and LSZOO	1936-19??	-
Reprovit	Copy stand with (II, IIa) or without (I) lights - Models I (ROOSE 1951), II (ROOXU 1951) & IIa (16788 1963)	1951-1963	-
RESOO	Carrying arm with OORES rotating upper stage	1936-19??	-
RFUOO	Regulating transformer for RIOOZ to control light	1936-19??	-
RGWOO	Object stage to flatten books for copying	1951-19??	16786
RIFLE	Rifle stock for use with Telyt lenses with long, right-angle eyepiece and double cable release; rare	1938-1939	-
RIOOX	Reprovit II base and column with arm, tape measure and switches	19??-19??	-
RIOOZ	Ring illuminator for Universal Copying Device	1936-19??	-
RKCOO	Reprovit 4-lamp unit	1951-19??	16785
ROOAI	Reprovit II focusing stage with bellows	1951-19??	16770
ROOAM	Reprovit II focusing stage with bellows with bayonet-mount	1960-19??	-
ROOFU	Reprovit I and Focoslide carrying arm to fit 1 5/8 inch column	1951-19??	-68-61-63-69-78
ROOKA	Large copying device with VELTU base and column, ROOMB arm, STAFO lighting, VEHIG and STAMA	1936-19??	-
ROOMB	Arm for ROOKA large copying device used with VELTU base and arm	1936-19??	-
ROONP	Copy arm to fit 1 1/4 inch column for Focoslide	1951-19??	-
ROOSE	Reprovit I Universal Copying Device consisting of OVAFO, ROOFU, OOZAB, OUTSO, ZOOXY and VALOO	19??-19??	-
ROOXU	Reprovit II Universal Copying Device consisting of RIOOX, ROOAI, RDQOO, OUTSO, DOOCO and RKCOO	1951-19??	16795, 16794-3/8" bush
ROOYH	26 mm repro extension tube	1951-19??	-59-78
ROSOL	Folding frame, open, chrome viewfinder for 50, 90, 135 mm lenses; early version also included 85 mm lenses; some have feet and meter calibrations for parallax correction	1951-19??	12040
ROXUM	Reprovit II for bayonet-mount Leica	1960-19??	16796, 16793-3/8" bush
RPNOO	Reprovit micro-addaptor for focusing stage with shutter, eyepiece, correction lens and double cable release	1951-19??	-
RPOOT	Reprovit micro-addaptor for focusing stage without shutter, eyepiece or cable release	1956-19??	-
RQPOO	Blue filter; screw-on type L for Summitar f= 5 cm 1:2	ca.1949	-
RSTOO	Reprovit micro-addaptor for focusing stage with shutter, eyepiece, 1/2x correction lens and double cable release	1951-19??
RTSOO	Reprovit micro-addaptor for focusing stage with 1/2x correction lens but without shutter, eyepiece or cable release	1956-19??	-
RWBOO	Deerskin pouch for RASAL	1933-19??	-