...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 |
| 4606273 | Railway carriage with set-off apparatus A set-off apparatus for moving a railway carriage transversely off the track includes eight vertically adjustable jacks arranged in four pairs. Two of the jacks of two of the pairs are arranged in each corner of the railway carriage frame, and two pairs o... | 08/19/1986 |