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US4719648A
(en)
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Coin relay drive and switching circuit for paystation telephone instruments
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BE372930A
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BE358714A
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BE382658A
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US1349373A
(en)
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Measured-service telephone system
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BE345811A
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BE387272A
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BE420471A
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BE538209A
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BE357752A
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BE412286A
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BE346960A
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BE391837A
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BE350560A
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BE635242A
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BE353077A
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BE383636A
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BE402117A
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CH96261A
(fr)
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Installation pour bureau central téléphonique du type manuel.
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BE351988A
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BE428323A
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