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1556904
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Information
Patent Grant
1556904
References
Source
Patent Number
1,556,904
Date Filed
Not available
Date Issued
Tuesday, October 13, 1925
99 years ago
CPC
H04M1/31 - by interrupting current to generate trains of pulses by periodically opening and closing contacts to generate trains of pulses
H04M1/34 - Lost-motion or other arrangements for ensuring a pause between successive digit transmissions
US Classifications
379 - Telephonic communications
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