Unclassified
Acoustic coupler
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Unclassified
Acoustic coupler
Device for coupling electrical signals by sound
rare · Q1361224
Related cards · communications device
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Works
International maritime signal flags
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Unclassified
Modem
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Concepts
International Code of Signals
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Places
Cell site
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Unclassified
Telecommunications equipment
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Unclassified
Carterfone
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