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 |
| 7082694 | Center point locator device Provided is a device that locates the center point of any one of a number of differently shaped objects in one manipulation. The device incorporates a bed plate and two opposing right angle sliding jaws to position a center punch or drill bit bushing to the center o... | 08/01/2006 |
| 6904689 | Guide device A guide device for cutting lap joints includes a frame and a rectilinear guide member, the frame having a Y-like shape and consisting of a removable top portion and a bottom portion forming a yoke therebetween at the upper portion of the Y-like frame. The lower port... | 06/14/2005 |
| 5437105 | Center finding device A center finding device for locating the geometric center of a workpiece having substantially parallel side surfaces including a pair of crossed arm members pivotally secured to each other by a tubular member with a marking pin received therein and secure... | 08/01/1995 |
| 5394617 | Eyewear lens mechanical center locating apparatus An apparatus for locating the geometrical center of a lens, whether in or out of an eyewear frame, includes a flat platform adapted to seat an eyewear lens thereon and a framework mounted on the platform and having first and second pairs of opposite side ... | 03/07/1995 |
| 5016509 | Combination handguide and measuring tool for use with table mounted wood working equipment The invention consists of a combination safety guide and measuring tool providing a safe, reliable means for advancing wood over or through table mounted wood working equipment, and in addition, providing a measuring tool for many important wood working p... | 05/21/1991 |
| 4958441 | Center punch block device A center punch block device is set forth wherein a main body includes a level pivotally mounted thereto within a slot transversely oriented within the block and transversely arranged to an elongate "V" slot formed within a lowermost surface of the body to... | 09/25/1990 |
| 4868995 | Apparatus and method for marking center of turning billet A center marker for locating and marking the ends of turning squares or billets prior to mounting them in lathe centers. The marker includes three orthogonal plates which are joined to form a corner, and the base plate is fitted with a knife which protrud... | 09/26/1989 |
| 4684299 | Liberty jig A jig for use in locating and drilling hole positions in cabinet doors and drawers. The jig comprises a stationary L-shaped member for placement at the corner of the door or drawer. A slidable member adjusts for direction along one axis and a pair of slid... | 08/04/1987 |
| 4603488 | Process and appliances for the pre-setting of cutting and ejection tools in a cutting press for box blanks A method and apparatus for pre-setting the mounting holes for cutting and ejection tools characterized by a template which has a pattern of holes including centering holes and an arrangement for positioning both a cutting form and an ejection board whethe... | 08/05/1986 |
| 4352247 | Square level for drawing angles and parallels A square for plotting angles, parallels, and polygonal shapes on the circular surface of a cylindrical body. The square includes a pair of contact arms forming a right angle, and a center arm forming a bisector of the right angle. A protractor frame is sl... | 10/05/1982 |