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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 |
| 4351383 | Bearings for continuous casting roller aprons Rollers used in roller aprons, which support and guide the metal strand formed in a continuous casting mold, are made of a fixed shaft and elongated roller sleeve sections which are rotatably mounted upon the shaft. The shafts are fastened upon spaced apa... | 09/28/1982 |
| 4255863 | Continuous casting mold taper gage A gage, for determining the taper angle of the inner faces of the end walls of a continuous casting mold, includes a pair of rigidly connected, spaced apart, elongated, wall contact strips having parallel straight edges for engaging the wall for substanti... | 03/17/1981 |
| 4246812 | Method and apparatus for boring a tapered, curved I.D. tubular casting mold A tapered and curved internal diameter is formed within a tube used as a continuous casting mold by feeding the tube lengthwise along an arc which is tangent to the axis of the spindle of a boring mill having a rotatable boring head arranged within the tu... | 01/27/1981 |
