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Stair tread structure
US 3,381,775 A
Filed
: 01/03/1967
Issued
: 05/07/1968
Est. Priority Date
: 01/03/1967
Status: Expired due to Term
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Current Assignee
Harold F. Livers
Original Assignee
Harold F. Livers
Inventors
Livers, Harold F.
Application Number
US04/606,848
Time in Patent Office
490 Days
Field of Search
US Class Current
182/228.2
CPC Class Codes
E04F 11/025
Stairways having stringers ...
E04F 11/112
of metal or with an upper l...
E04F 11/163
Protecting means for edges ...
E04F 11/17
Surfaces guard covers of st...
E04F 11/1812
Details of anchoring to the...
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