The first match was accidentally discovered in 1826 when John Walker scraped a stick with chemicals on the end against a stone floor.
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| Number | Title | Issue Date |
| 7331741 | Numerically controlled machine tool A numerically controlled machine tool performs machining by rotating a rotational tool attached to a tool holder mounted on a spindle, with keys fitted into key grooves in the tool holder. The numerically controlled machine tool includes predetermined-amount rotatin... | 02/19/2008 |
| 7260877 | Boring and turning mill A boring and turning mill, comprising a nonrotatable tool ram, a rotationally drivable tool spindle in the tool ram, an auxiliary head which can be attached to the tool ram in a nonrotatable manner, two work slides arranged in opposition to each other and displaceab... | 08/28/2007 |
| 7217071 | Method for testing the fit or imbalance of a tool In the method, a tool is tested for an aligning fit or an imbalance in a tool spindle. The tool spindle is set into rotation. A light beam is used to check whether the tool wobbles. The tool spindle and the light beam are moved relative to one another until the ligh... | 05/15/2007 |
| 7128504 | Spring tracer for duplicating machine for punched and laser keys An improved spring tracer for duplicating machine for punched and laser keys comprising a longitudinal spindle suspended from an end of a synchronous lateral lever having the other end laterally connected to a longitudinal shaft for a duplicating tool in parallel wi... | 10/31/2006 |
| 5833406 | Duplicating machine, particularly for punched and laser keys A duplicating machine for punched and laser keys. The machine has on a base two clamps moving simultaneously in a horizontal plane for an original key to be duplicated and for a key blank to be cut, and a carriage moving vertically relative to the clamps ... | 11/10/1998 |
| 5818605 | Method and apparatus for high resolution sensing of engraving stylus movement Method and apparatus for high resolution sensing of engraving stylus movement for dynamic control of an engraving machine while engraving, improved calibration and as a tool used to assist in selecting acceptable gravure cylinders and improving the manufa... | 10/06/1998 |
| 5655422 | Tool head for use in machine tools A tool head for use in machine tools has an adjustable slide (18) capable of moving with respect to the base body (10) transversely to its axis of rotation (12) and of being provided with a tool holder, as well as a device (30) for direct measurement of t... | 08/12/1997 |
| 5312212 | Axially compliant tool holder An axially compliant tool assembly for a programmable position controller is disclosed. Various construction details have been developed which provide a responsive means to make the tool axially compliant to deviations between the programmed path of the t... | 05/17/1994 |
| 5113677 | Apparatus and method for selectively forming a thickened edge on a plate of formable material In conventional fabrication manufacture the thickness of the steel plates are often determined by the metal section required at the weld joints. The subject apparatus and method overcomes this problem by selectively forming a thickened edge along the edge... | 05/19/1992 |
| 5029011 | Engraving apparatus with oscillatory movement of tool support shaft monitored and controlled to reduce drift and vibration An engraving apparatus for engraving the outer surface of a cylinder used in a gravure printing process includes an engraving stylus mounted onto a shaft for engraving the surface of the cylinder. A drive mechanism is employed for producing angular moveme... | 07/02/1991 |
| 4712953 | Method and apparatus for aligning cutting tools Bore holes are formed in opposite side walls of a part in alignment with each other by two separate cutting tools in two separate machine tools disposed on opposite sides of the part. One of the machine tools is a master and the other is a slave with the ... | 12/15/1987 |
| 4676704 | Apparatus to make the crosswise movement of the toolholder slide mounted on the spindle of a tool machine automatic during the cutting motion An apparatus for connection to a machine tool having a rotating head and a fixed part is capable of automatically moving a cutting tool radially while a spindle carrying the cutting tool rotates. The apparatus includes a body which is engageable to the to... | 06/30/1987 |
| 4440530 | Machine tool with tool position compensating apparatus and contact detecting apparatus A machine tool includes a tool holder supporting a cutting tool and receivable in a tool spindle. A device is provided in the tool holder to be engageable with a work table for adjusting the radial position of the cutting tool by utilizing the relative mo... | 04/03/1984 |
| 4425061 | Tool setting device for machining center A tool setting device for a machine tool (10) having a numerical control (22) includes a gage unit (24) with a frame (26) adapted to be secured upon a slide (20) of the machine tool. A photodetector, which includes a source (96) and a receiver (98), is mo... | 01/10/1984 |
| 4273482 | Automatic tool-moving machine An automatic machine for displacing a shaping tool, such as a router, over a work area includes a tool mounting assembly carried by support means such as an articulated arm. The arm is movable by first movement means relative to fixed structure of the mac... | 06/16/1981 |
| 3962952 | Automatic milling slide control Automatically adjustable stop for establishing limit of hydraulically powered axial advance for a milling spindle head with positive means for holding the spindle in fixed advance position during the milling operation along a plane normal to the spindle a... | 06/15/1976 |