US3090282A
|
|
Mechanism for controlling the axial displacements of optical elements
|
US2847907A
|
|
Variable focal-length objectives
|
US2873646A
|
|
Mechanism for variable focal length objective
|
US2747340A
|
|
Machine for polishing optical surfaces
|
US2738702A
|
|
Projection control device for projectionists
|
US2649022A
|
|
Wide-angle photographic objective lens assembly
|
US2649021A
|
|
Large aperture photographic objective
|
US2579247A
|
|
Mirror operating device for reflex cameras
|
US2106397A
|
|
Optical adjusting device for cinematographic apparatus
|