4. Telephonic communications
  5. With check operated control

Burd, Bartz & Gutenkauf

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Coin operated box telephone unit

Recording – communication – or information retrieval equipment – Computer – data processor equipment
Patent

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Coin-operated telephone box

Recording – communication – or information retrieval equipment – Computer – data processor equipment
Patent

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Combined telephone, coin box and support therefor

Recording – communication – or information retrieval equipment – Computer – data processor equipment
Patent

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Pay telephone

Telephonic communications – With check operated control
Patent

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