United States Patent 3351405
Inventors:
Ferdinand, Irwin J.
Lopatka, Dale R.
Publication Date:
11/07/1967
Assignee:
HIRSH MFG CO SA
Other Classes:
312/196, 160/231.100, 160/202
International Classes:
E06B9/11
Foreign References:
| FR1139633A | | | | |
| DE972682C | | | | |
| IT546091B | | | | |