United States Patent 2535489
Inventors:
Edwards, Harold T.
Publication Date:
12/26/1950
Assignee:
Edwards, Harold T.
Other Classes:
623/64, 623/63, 623/62, 623/27, 623/58
International Classes:
A61F2/58; A61F2/00; A61F2/50
Foreign References:
| AT153591B | | | | |
| GB168473A | | | | |
| IT248698B | | | | |
| DE297320C | | | | |