4. Electrical audio signal processing systems and devices
  5. Electro-acoustic audio transducer

Michael A. Stein

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Acoustic insulator for a telephone handset microphone

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

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Component to component sealing method

Pipe joints or couplings – Particular interface
Reexamination Certificate

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Component to component sealing method

Metal working – Method of mechanical manufacture – Assembling or joining
Reexamination Certificate

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Diaphragm valve

Fluid handling – With leakage or drip collecting
Patent

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Gas discharge lamp ballast with equally spaced windings

Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Transformer in the supply circuit
Patent

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Profile ID: LFUS-PAI-P-1173134

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