United States Patent 3481635
Inventors:
Tracy, Charles W.
Publication Date:
12/02/1969
Assignee:
INTERN ENTERPRISES INC
Other Classes:
403/232.100, 403/191
International Classes:
E04B1/26; E04B7/06; F16B9/00; F16B5/00; F16B7/00
US Patent References:
| 3333875 | Bracket system for roof framing | | | |