Sound translating device arranged to eliminate extraneous sound

• US 2,603,724 A
• Filed: 10/30/1948
• Issued: 07/15/1952
• Est. Priority Date: 10/30/1948
• Status: Expired due to Term

• Current Assignee: Alfred H. Kettler
• Original Assignee: Alfred H. Kettler
• Inventors: Kettler, Alfred H.
• Application Number:
  US03/057,475
• Time in Patent Office: 1,354 Days
• US Class Current: 381/372
• CPC Class Codes: H04M 1/19 Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor circuit arrangements for preventing eavesdropping H04M1/68; telephone cabinets E04H1/14

Claims