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US2580021A
|
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Method and means for generating high electrical potential
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US2509496A
|
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Means for landing aircraft and other objects by parachute
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US2386395A
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Shock absorber for parachutes
|
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US2280703A
|
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Process for granulating metals
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US1730505A
|
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Photo-electric cell
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US1588886A
|
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Photo-electric apparatus
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US1578514A
|
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Photographic means for recording sound
|
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US1588885A
|
|
Combustion-pressure apparatus
|
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US1552926A
|
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Photo-electric means for reproducing sound from graphical records
|
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US1647353A
|
|
Photo-electric means for reproducing sound from graphical records
|
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GB236266A
|
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Improvements in the processes of manufacturing selenium cells for photo-electric work
|
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US1558673A
|
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Means for reproducing sound from graphical records
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|
US1615979A
|
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Telephotographic recording apparatus
|
|
US1558672A
|
|
Telephotographic sending apparatus
|
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US1627387A
|
|
Means for photographically recording sound
|
|
US1588884A
|
|
Photographic means for recording sound
|
|
US1491040A
|
|
Process of manufacturing selenium cells for photo-electric work and crystal radiodetectors
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