Alfred Hengst
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E. Leitz Photographic Patents by Alfred Hengst
- 1975 APR 28 - BINOCULARS WITH DOUBLE BRIDGE AND RESILIENT BIASING see Trinovid 8 x 20 C
- 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 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 above
- 1996 JUL 29 - CAMERA HOUSING with Manfred Meinzer see R9
