4. H - Electricity
  5. 04
  6. Q

Toll switching telephone system

H - Electricity – 04 – Q

Patent

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344/47

H04Q 3/47 (2006.01)

Patent

CA 633312

Gooderham John W.

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Jacobitti Edward

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Myers Oscar

H - Electricity – 04 – Q
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Shipley Frank F.

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Strickler Walter B.

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G - Physics – 21 – G
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Western Electric Company Incorporated

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