Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 4057112 | Subsoil plow A subsoil plow having a plurality of forwardly facing C-shaped plow teeth arranged on a rigid frame in a generally V-shaped array. Each plow tooth has an upper portion, a curved shank portion, and a bottom tip and is mounted on the frame by a so-called pi... | 11/08/1977 |
