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Tubular interlocking joint
US 2,980,215 A
Filed
: 11/12/1957
Issued
: 04/18/1961
Est. Priority Date
: 11/12/1957
Status: Expired due to Term
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Current Assignee
Ernest Englund
Original Assignee
Ernest Englund
Inventors
Englund, Ernest
Application Number
US03/695,834
Time in Patent Office
1,253 Days
Field of Search
US Class Current
138/157
CPC Class Codes
E04B 7/105
Grid-like structures
E04C 2003/0413
being built up from several...
E04C 2003/0417
demountable
E04C 2003/043
the hollow cross-section co...
E04C 2003/0439
the cross-section comprisin...
E04C 2003/0452
H- or I-shaped
E04C 3/04
of metal E04C3/29 takes pre...
F16B 3/00
Key-type connections; Keys ...
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