Door recorder

• US 2,051,986 A
• Filed: 09/20/1932
• Issued: 08/25/1936
• Est. Priority Date: 09/20/1932
• Status: Expired due to Term

• Current Assignee: Henry R. Cool
• Original Assignee: Henry R. Cool
• Inventors: Cool, Henry R.
• Application Number:
  US02/633,962
• Time in Patent Office: 1,435 Days
• US Class Current: 346/41
• CPC Class Codes: G07C 1/08 wherein the time is indicated by marking an element, e.g. a card or tape, in position determined by the time

Claims