Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04Q
SELECTING
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1/00
Details of selecting apparatus or arrangements
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H04Q1/30
Signalling arrangements; Manipulation of signalling currents
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H04Q1/32
using trains of DC pulses
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H04Q1/36
Pulse-correcting arrangements, e.g. for reducing effects due to interference
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