Janis Joplin
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Telephone switchboard
General Electric
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Agner Krarup Erlang
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Kerman, California
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Aetna
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ITT Inc.
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World's Columbian Exposition
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Telephony
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Switched loop
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Ringdown
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Interposition trunk
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Cord circuit
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Automatic switching system
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1880s
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1894
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Telephone
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Telecommunications in Spain
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Rotary dial
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Nokia
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