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H04M 1/515

Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling

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Edits on 16 Mar, 2022

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edited on 16 Mar, 2022

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Edits on 5 Mar, 2022

"update inverses"

edited on 5 Mar, 2022

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H04M 1/515

Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling

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Cooperative Patent Classification

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Website

http://data.epo.org/linked-data/def/cpc/H04M1-515

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