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Hollow girder for light structures
US 1,656,810 A
Filed
: 07/23/1924
Issued
: 01/17/1928
Est. Priority Date
: 08/11/1923
Status: Expired due to Term
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Current Assignee
Karl Arnstein
Original Assignee
Karl Arnstein
Inventors
Arnstein, Karl
Application Number
US02/727,849
Time in Patent Office
1,273 Days
Field of Search
US Class Current
52/634
CPC Class Codes
B64C 1/065
Spars
B64C 2001/0081
from metallic materials
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