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US1174547A
(en)
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Method of and apparatus for testing visual acuity.
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US2471368A
(en)
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Gunfire control training apparatus
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SE128226C1
(cs)
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US2420633A
(en)
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Instrument for testing and developing the stereoptic acuity of a person's eyes
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US1467163A
(en)
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Automatic protracting apparatus combined with two computing theodolites
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US2387555A
(en)
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Apparatus for plotting maps from photographs
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US1811688A
(en)
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Apparatus for use in the laying of antiaircraft guns
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US1974654A
(en)
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|
Comparison magnascope |
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US1542112A
(en)
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Lens-testing instrument
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US1479036A
(en)
|
|
Detectoscope
|
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US3024696A
(en)
|
|
Projection system
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US2296928A
(en)
|
|
Projecting apparatus
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US2197487A
(en)
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|
Head lamp meter
|
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US2311769A
(en)
|
|
Range controlled speed indicator
|
|
US2425713A
(en)
|
|
Stereoscopic range and height finder with adjustable reticles
|
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US2153718A
(en)
|
|
Navigation apparatus for aircraft
|
|
US1404662A
(en)
|
|
Clair |
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US2965979A
(en)
|
|
Training device for mark 14 gunsight
|
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US1412758A
(en)
|
|
Sighting device for ordnance
|
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US1529225A
(en)
|
|
Range finder for submarine and other periscopes
|
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US1757874A
(en)
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Apparatus for determining the course of aircraft
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US1817907A
(en)
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|
Position comparator
|
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US1762800A
(en)
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|
Fire-control apparatus for firing at movable targets
|
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US1297967A
(en)
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Apparatus for training range-finder operators.
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US673099A
(en)
|
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Range-finder.
|