1812559

Information

• Patent Grant
• 1812559

• References
• Source

• Patent Number

  1,812,559

• Date Filed

  Not available

• Date Issued

  Tuesday, June 30, 1931
  93 years ago

• CPC

  • B61L29/243 - Transmission mechanism or acoustical signals for gates

• US Classifications

  • 092 - Expansible chamber devices
  • 049 - Movable or removable closures