United States Patent 2483555
Inventors:
Nichols, Harry J.
Publication Date:
10/04/1949
Assignee:
Nichols, Harry J.
International Classes:
F42C9/14; F42C15/192; F42C15/196; F42C9/00; F42C15/00
Foreign References:
| GB191420892A | | | | |
| GB257333A | | | | |
| FR34025A | | | | |
| SE83957A | | | | |
| FR837467A | | | | |