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PCE
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CPC Subgroup
H04M 1/71

Substation extension arrangements

Full Title

Substation equipment, e.g. for use by subscribers (subscriber services or facilities provided at exchanges H04M3/00; prepayment telephone coin boxes H04M17/00; current supply arrangements H04M19/08) > Substation extension arrangements

1 direct subcode

Child Classifications

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  • H04M 1/715 using two or more extensions per line (cordless telephones H04M1/725)