4. Telephonic communications
  5. Telephone line or system combined with diverse electrical...
  6. Having transmission of a digital message signal over a...

Tsunehiro Watanabe

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Communication apparatus

Telephonic communications – Supervisory or control line signaling – Using line or loop condition detection
Patent

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Communication apparatus able to call plural designated destinati

Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy
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Communication apparatus for detecting a calling signal from a li

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent

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Communication apparatus for detecting a calling signal from a li

Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent

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Communication apparatus with facilities for changing to a pulse

Telephonic communications – Supervisory or control line signaling – Substation originated
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Profile ID: LFUS-PAI-P-108441

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