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US3255333A
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Push button switch construction
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US3226520A
|
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Illuminated push button switch assembly including latching means
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US3230296A
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Contact terminal assembly with different geometric configured contacts on either side of a plate
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US3164697A
|
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Rotary armature miniature relay
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US3170070A
|
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Current detecting system
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US2866870A
|
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Rotary armature and stator for use in relays
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US2822435A
|
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Switching system
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US2731518A
|
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Telephone unit
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US2652171A
|
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Cover securing means for wall boxes
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US2581861A
|
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Electrical apparatus
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US2500184A
|
|
Electrical apparatus
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US2405735A
|
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Hospital plug connection
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|
US2328556A
|
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Transmitting system
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US2263877A
|
|
Transmitting system
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US1909153A
|
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Thermionic amplifier
|
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US1936245A
|
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Telephone
|
|
US1847061A
|
|
Intercommunicating telephone
|
|
US1240974A
|
|
Telephone wall set.
|
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US1190548A
|
|
Telephone-receiver.
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|
US1204766A
|
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Selective signaling device.
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