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...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 |
| 4634982 | Capacitive measuring element for oscillometric measurement of conductance of streaming solutions and method of determining the dimensions thereof The invention relates to a capacitive measuring element intended for continuous measurements of conductance in streaming solutions. The essence of the measuring element is that in the measuring space the surfaces limiting it are covered by an electrically... | 01/06/1987 |
