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GB247134A
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Improvements in or relating to photographic objectives
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GB254255A
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Improvements in or relating to keyboard mechanism especially adapted for use with calculating machines
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US1588612A
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Photographic triplet
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DE461062C
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Eyepiece consisting of three positive parts with a large field of view
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DE435492C
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Keyboard, especially for calculating machines
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US1573999A
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Teleobjective
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GB234474A
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Improvements in or relating to mounts for colour filters, auxiliary lenses or the like for photographic objectives
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GB234091A
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Improvements in or relating to lenses
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GB231848A
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Improvements in or relating to the polarisation of light
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DE425146C
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Photographic, spherically, chromatically and astigmatically corrected, distortion-free lens
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DE428825C
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|
Photographic lens consisting of four system parts separated from one another by air gaps
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DE432240C
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Photographic apparatus for dactyloscopy
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DE434355C
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Headlights for motor vehicles with removable end window
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DE422370C
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Device for the mechanical determination of the resulting effect of two arbitrarily crossed cylindrical glasses
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DE422125C
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Printing unit for calculating machines
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DE446401C
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Druckhaemmerspannwerk for printing units of calculating machines
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DE422710C
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Device for clamping color filters, auxiliary lenses and the like. Like. On lens mounts
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DE434877C
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Prism double telescope with exchangeable magnification
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DE437246C
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Telephoto lens
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GB215738A
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Improvements in or relating to photographic lenses
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