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Multi-step locking eye cup twist up device
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Pocket transit
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Lens cap apparatus for optical instrument
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Carrying case for binoculars
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Low profile compass with removable protective cover and magnetic bull's eye alignment system
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Interactive packaging
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Electronic rangefinder apparatus
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Floating disk compass
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Compass
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Error sensing system for vessels with absolute zero referencing
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Angular measurement apparatus with referencing system
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Autopilot system
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Recreational compass
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Self-contained downhole compass
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Data read-out system and apparatus useful for angular measurements
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|
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Digital compass
|
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|
|
Data read-out system and apparatus useful for angular measurements
|
|
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|
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Angular displacement measuring apparatus with strobe means
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US3950859A
|
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Angular displacement measuring apparatus
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