4. H - Electricity
  5. 04
  6. R

Raymond C. Freeman

H - Electricity – 04 – R

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Dynamic telephone receiver with magnetic shunt

H - Electricity – 04 – M
Patent

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Electroacoustic transducer having an inverted diaphragm

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Patent

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Telephone alerter

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Telephone alerter

H - Electricity – 04 – R
Patent

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Profile ID: LFCA-PAI-P-580575

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