4. H - Electricity
  5. 04
  6. M

Communication system

H - Electricity – 04 – M

Patent

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Details

379/5

H04M 11/06 (2006.01)

Patent

CA 408039

Fernand Emile D'humy

H - Electricity – 04 – M
Inventor

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Lawrence Walsh Franklin

H - Electricity – 04 – M
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G - Physics – 21 – G
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The Western Union Telegraph Company

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