Printed circuit, in particular for keyboards, and method for manufacturing such a printed circuit
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Circuit board, especially for key-operated dialling blocks
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Printed circuit board, particularly for push-button dial blocks, and method of manufacturing such a printed circuit board
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TOGGLE SWITCH
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Method and device for soldering surface-mountable components on printed circuit boards (circuit carrying boards) with track patterns
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DECODING CIRCUIT FOR DERIVING SWITCHING SIGNALS CORRESPONDING TO A SPECIFIC SYMBOL FROM A BUTTON ARRANGEMENT
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Multi-frequency tone generator, particularly for telephone sets
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Keyboard for initiating switching operations or switching signals associated with respective symbols on the surfaces of the keys
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Circuit for howl suppression in telephone sets with loudspeaker amplifiers
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Spring-measuring and spring-testing device
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Circuit arrangement for connecting the speech circuit or the dialling circuit of a push-button dialling telephone set to the connection line
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Circuit arrangement for switching over a changeover relay which determines the connection of either the speech circuit or the dialling circuit of a push-button telephone set to the connection line
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Key pad unit for telephone sets - has permanent magnet on base of press button shaft to operate feed contact when depressed
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Protective switch for communication circuits - has spring loaded lever supported by elastic strip operated by eccentric
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Fine fuse insert incorporating metal tube - with soldered metal pin and surrounded by insulated heat conducting winding
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Pushbutton switch in rectangular housing - has slide with switching mechanism with spring scanning labyrinthine switching link
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Overcurrent protective switch for communication systems - has switching slide with contacts, in recess of insulating plate, covered by two other plates
