Title:
Concrete prestressing apparatus
United States Patent 3343808


Inventors:
Howlett, James W.
Application Number:
US30262863A
Publication Date:
09/26/1967
Filing Date:
08/16/1963
Assignee:
HOWLETT MACHINE WORKS
Primary Class:
Other Classes:
24/136R, 29/452, 403/314, 403/371
International Classes:
E04G21/12
View Patent Images:
Foreign References:
DE957685C
CH86778A1920-10-01