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Magician Harry Houdini patented a "Diver's Suit" enabling the wearer to "quickly divest himself of the suit while being submerged and to safely escape and reach the surface of the water."
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| Number | Title | Issue Date |
| 5458207 | Method and an equipment for adjusting rock drilling A method for optimizing rock drilling, wherein the drilling is adjusted by means of one or more adjustable parameters such as the feed rate and the rotation rate. In the method, a set value (Hs) of each adjustable parameter is deviated in accor... | 10/17/1995 |
| 4719978 | Earth drilling device To rotate a pipe (17) to be urged into the ground, a rotary disk (20) clamped at said pipe (17) is pivotable on a table (19) which carries two groups of driving cylinders (40, 41). While the first group is operative to carry out the working stroke in orde... | 01/19/1988 |
| 4431063 | Drive mechanism for drill A drive mechanism for a drill provides both rotational drive and axial feed for a drill of substantial diameter such as those used to drill holes for roof bolts in mine shafts. A plurality of sprockets carry two chains of drive links which interlock aroun... | 02/14/1984 |
| 4421183 | Flexible drive apparatus for boring lateral bore holes from well Apparatus is provided for penetrating boreholes in oil wells. The apparatus includes a shaft rotatable by power means. First means may be operatively associated with the shaft and a rod to obtain a rotation of the rod by the shaft. Second means obtain a l... | 12/20/1983 |
