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Marc F: Early Bell System Data-phone
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Marc F: Dataphone
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Marc F: Dataphone Set
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Marc F: Internal View of a Bell System Dataphone
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Marc F: Bell System Dataphone
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Marc F: Western Electric 901B Data Test Set
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Marc F: Western Electric 901A Data Test Set
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Marc F: Data Set 201A, Cover Removed
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Marc F: Data Test Center
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Marc F: we pic 4 005
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Marc F: Data Set 401F Receiver
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Marc F: 12V & 24V Semiconductor Rectifier
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Marc F: 202B Data Set, Rear View
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Marc F: we pic 4 013
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Marc F: Data Set 201A, Cover Removed