IPIQ

H

ELECTRICITY

H04

ELECTRIC COMMUNICATION TECHNIQUE

H04Q

SELECTING

1/00

Details of selecting apparatus or arrangements

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H04Q1/18

Electrical details

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H04Q1/30

Signalling arrangements; Manipulation of signalling currents

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H04Q1/44

using alternate current

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H04Q1/444

with voice-band signalling frequencies

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Sorry, no patents found.