Automatic change-over

US 2,626,628 A
Filed: 12/17/1948
Issued: 01/27/1953
Est. Priority Date: 12/17/1948
Status: Expired due to Term

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Current Assignee
Harold L. Norway, Willis A. Perry
Original Assignee
Harold L. Norway, Willis A. Perry
Inventors
Norway, Harold L., Perry, Willis A.

Application Number

US03/065,888
Time in Patent Office

1,502 Days
Field of Search
US Class Current

137/113
CPC Class Codes

F17C 13/045   Automatic change-over switc...

Y10T 137/2569   Control by depletion of source

Y10T 137/8158   With indicator, register, r...