Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 3967522 | Valve for pipe organs The valve member of a solenoid operated valve adapted to be mounted within the windchest of a pipe organ for opening and closing an aperture leading to a pipe is provided with a circular projection on one surface thereof adapted to project into the circul... | 07/06/1976 |
| 3957246 | Gate valve and method of manufacture A gate valve having a body made in two parts, namely a main part having flow passages and at least one body extension that accommodates movement of the gate between open and closed positions. The extension is generally rectangular as viewed from one end o... | 05/18/1976 |
