United States Patent 2812716
Inventors:
Gray, Donald E.
Publication Date:
11/12/1957
Assignee:
Gray, Donald E.
Other Classes:
600/16, 128/DIG.003, 92/92, 604/153, 417/426, 184/29
International Classes:
F04B43/08; F04B43/107; F04B43/00
Foreign References:
| GB189007172A | | | | |
| AU109023B | | | | |
| GB287267A | | | | |
| GB305235A | | | | |