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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 |
| 5252162 | Multiple chamber drip irrigation hose made from a single strip A multiple chamber hose for drip irrigation and the like, with a primary chamber for fluid flow therethrough and a multiple layer section having a primary layer, a mid layer and a secondary layer, and with a secondary chamber in said mid layer for fluid f... | 10/12/1993 |
