First Sentence:
In 1875, the year before the all-important telephone patent was issued, two people were working separately on telegraph improvements that would lead to the development of the telephone.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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magneto wall phone, candlestick desk stand, ringer box, biased ringers, polarized ringer, booster circuit, retardation coil, handset desk, coffin telephone, dial blank, gallows telephone, cylindrical armature, ringer circuit, bakelite housing, transmitter arm, talking circuit, hook switch, selective ringing, liquid transmitter, patent caveat, terminal markings, transmitter voltage, resistance transmitter, combined telephone, split winding
Key Phrases - Capitalized Phrases (CAPs):
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Western Electric, Bell System, Line Line, Bell Laboratories, Northern Electric, World War, Automatic Electric, Bell Labs, Patent Office, New York, Western Union, Charles Williams
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