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  5. Polystation line system
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Secure anti-jamming wireless party line

Telephonic communications – Polystation line system – Portable or mobile
Patent

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Selective ringing circuit for a telephone

Telephonic communications – Polystation line system – Call alerting
Patent

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Solid state remote actuable switch

Telephonic communications – Polystation line system
Patent

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Station controller for distributed single line PABX

Telephonic communications – Polystation line system
Patent

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Switching apparatus for use in telephone house wiring

Telephonic communications – Polystation line system
Patent

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