|
US3222755A
|
|
Method of assembling an electrode
|
|
US3185925A
|
|
Electroncephalographic analyzing and recording apparatus
|
|
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|
|
Variable speed paper feeding drive
|
|
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Film feed for camera
|
|
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|
Film holding device for cameras
|
|
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Force measuring instrument
|
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Oscillographs
|
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Electrically operated automatic camera
|
|
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Oscillograph
|
|
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|
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Rate measuring and comparing circuit
|
|
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|
|
Scanning system
|
|
US2527718A
|
|
Phase and amplitude responsive control system
|
|
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Automatic range tracking apparatus
|
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CA542892A
|
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Oscillographs
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