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GB619951A
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Improvements in optical projectors
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GB603730A
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Portable photographic enlarging camera and carrier
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GB579341A
|
|
Improvements in strip or film-gates for picture projectors, cameras, and other apparatus using a film or strip material
|
|
GB591229A
|
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Masking board for use in photographic projection printing
|
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GB581383A
|
|
Improvements in operating mechanism for strip or film gates for picture projectors
|
|
GB583488A
|
|
Improvements in optical projectors
|
|
GB577995A
|
|
Improvements in plate or film holders for photographic cameras
|
|
GB573007A
|
|
Improvements in the operation of photographic camera shutters
|
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GB439943A
|
|
Improvements in and relating to cinematograph projectors
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|
GB205897A
|
|
Improvements in or relating to mechanism such as in applicable to impulse-sending devices for automatic telephone systems
|
|
GB205209A
|
|
Improvements in or relating to automatic exchange telephone apparatus
|
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GB205208A
|
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Improvements in or relating to automatic exchange telephone-apparatus
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