4. H - Electricity
  5. 04
  6. M

James R. Darwood

H - Electricity – 04 – M

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Telephone answering system

H - Electricity – 04 – M
Patent

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Telephone answering system with remote playback

H - Electricity – 04 – M
Patent

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Telephone ring detector circuit

H - Electricity – 04 – M
Patent

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Voice operated electric circuit

H - Electricity – 04 – M
Patent

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Profile ID: LFCA-PAI-P-122121

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