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 |
| 4346718 | Apparatus and methods for recording time intervals A time interval recorder stores the magnitude of time intervals between events, e.g. heartbeats, over a period. The data is stored as a sequence of pairs of numbers representing respectively the magnitude of a time interval and the number of successive oc... | 08/31/1982 |
