2158537

Information

• Patent Grant
• 2158537

• References
• Source

• Patent Number

  2,158,537

• Date Filed

  Not available

• Date Issued

  Tuesday, May 16, 1939
  85 years ago

• CPC

  • G10K7/06 - in which the sound-producing member is driven by a fluid

• US Classifications

  • 116 - Signals and indicators