United States Patent 2489828
Inventors:
Springer, Kenneth F.
Publication Date:
11/29/1949
Assignee:
Springer, Kenneth F.
Other Classes:
5/627, 5/625
International Classes:
A61G1/01; A61G1/00
Foreign References:
| GB352496A | | | | |
| DE440645C | | | | |
| GB554366A | | | | |
| DE577692C | | | | |
| FR742696A | | | | |