|
US3303535A
|
|
Sand mold patterns formed of porous or permeable metal
|
|
US1849549A
|
|
Optical printing apparatus
|
|
US1950092A
|
|
Optical printing apparatus
|
|
US1950693A
|
|
Mechanical filter
|
|
US1819476A
|
|
Lens mount
|
|
US1884171A
|
|
Sound reproducing device
|
|
US1811365A
|
|
Roller support for traveling films
|
|
US1827206A
|
|
Film support for photographic apparatus
|
|
US1884170A
|
|
Photographic sound recording and reproducing apparatus
|
|
US1820484A
|
|
Focusing lens mount
|
|
US1821399A
|
|
Apparatus for indicating printing light values
|
|
US1829235A
|
|
Slit-forming device for photographic sound apparatus
|
|
US1817320A
|
|
Motion picture printing apparatus
|
|
US1823280A
|
|
Compensating governor
|
|
US1868910A
|
|
Governor
|
|
US1950091A
|
|
Marking device for sound films
|
|
US1865272A
|
|
Film magazine for motion picture cameras
|
|
US1818502A
|
|
Sound reproducing apparatus
|
|
US1862062A
|
|
Sound reproducing apparatus
|
|
US1863066A
|
|
Film magazine
|
