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Protective helmet with voice communication system

  • US 4,152,553 A
  • Filed: 04/05/1978
  • Issued: 05/01/1979
  • Est. Priority Date: 04/05/1978
  • Status: Expired due to Term
First Claim
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1. In a protective helmet of the type including a voice communication system for selectively operating in transmitting and receiving modes, the improvement comprising:

  • said protective helmet including a rigid portion capable of vibration in the audio frequency range;

    an audio signal transducer including a vibratable drive member, actuable in response to a received signal; and

    ,said drive member being positioned relative to said helmet to drivingly contact said rigid portion whereby said rigid portion functions as a diaphragm of the transducer to produce signals in the audio frequency range.

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