Alfred Hengst
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E. Leitz + Leica Photographic Patents by Alfred Hengst of Lahnau, Germany
- 1975 APR 28 - BINOCULARS WITH DOUBLE BRIDGE AND RESILIENT BIASING (see Trinovid 8 x 20 C)
- 1977 SEP 27 - BINOCULARS (Canadian Patent see right image above)
- 1978 APR 17 - ILLUMINATION SYSTEM FOR PHOTOGRAPHIC ENLARGERS
- 1980 MAY 20 - BINOCULAR TELESCOPE WITH INTERNAL FOCUSING
- 1981 SEP 25 - BINOCULAR with Heinrich Janke and Hans-Kurt Uellenberg (see Trinovid 8 x 20 BC.)
- 1981 SEP 25 - BINOCULAR with Heinrich Janke, Heinz Keiner and Hans-Kurt Uellenberg (see Trinovid 8 x 32 BA)
- 1984 MAY 03 - BINOCULAR with Heinrich Janke and Hans-Kurt Uellenberg
- 1984 MAY 23 - BINOCULAR with Heinrich Janke and Hans-Kurt Uellenberg (see left image above)
- 1993 SEP 15 - MONOCULAR TELESCOPE HAVING A FOCUSING UNIT WHOSE MECHANICAL SENSITIVITY CAN BE VARIED with Heinz Keiner and Lothar Kölsch
- 1995 MAR 10 - SUSPENSION LUG AND LOCKING ELEMENT FOR A CARRYING STRAP with Ernst Ruehl
- 1996 JUL 29 - CAMERA HOUSING with Manfred Meinzer (see R9)
- 2002 AUG 14 - ARRANGEMENT FOR ROTATABLE ADJUSTMENT OF A CAP ON AN EYEPIECE HOUSING with Philipp Syre
- 2003 JAN 09 - PLAY-FREE ROTARY MOUNTING with Rolf Speier (see Ultravid 8 x 20 BL)
- 2004 APR 20 - ARRANGEMENT FOR ROTATABLE ADJUSTMENT OF A CAP ON AN EYEPIECE HOUSING with Philipp Syre
- 2005 MAY 18 - FOCUSING DEVICE WITH DIOPTER ADJUSTMENT with Rolf Speier (see Ultravid 8 x 20 BL)
