Alfred Hengst
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E. Leitz Photographic Patents by Alfred Hengst
- 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