4. Communications: electrical
  5. Continuously variable indicating
  6. With meter reading

Irving Harold Holden, deceased

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Mass excited acoustic device

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer
Patent

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Taut armature reciprocating impulse transducer

Communications: electrical – Continuously variable indicating – With meter reading
Patent

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Profile ID: LFUS-PAI-P-437443

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