Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7043850 | Transparent measuring device with seam allowance guide A transparent measuring device having a planar structure, a plurality of markings, at least one window, and a seam allowance guide. The planar structure has an upper surface and a lower surface, and the markings are formed on the lower surface of the planar structur... | 05/16/2006 |
| 6978550 | Protractor and ruler combination A protractor and ruler combination includes a main ruler having a side formed with a protractor, a secondary ruler rotatably mounted on the main ruler, and an auxiliary ruler having a side secured on the secondary ruler, so that the secondary ruler is moved in conce... | 12/27/2005 |
| 6694633 | Common rafter and hip layout tool A common rafter and hip layout tool which provides a protractor portion, a common cut marking edge, a common cut marking edge pantograph arm to which is connected a bird's mouth marking arm, a seat cut marking arm connected at a right angle to the bird's ... | 02/24/2004 |
| 6260283 | Multi-functional carpentry tool A multi-functional carpentry tool includes a base plate having opposed front and back major surfaces, and at least one side edge bearing surface perpendicular to the front and back surfaces. A pivot ruler is secured to the base plate and extends across an... | 07/17/2001 |
| 5915807 | All-in-one drawing apparatus An all-in-one drawing apparatus has a protractor integrated with horizontal and vertical rulers on a drawing board. The vertical ruler has a pen holder adapted to move and scribe within the vertical ruler. The vertical ruler can pivot according to measure... | 06/29/1999 |
| 5226238 | Infinite square A drawing aid device having a base upon which is positioned a rotating cap. The rotating cap is provided with a slot guide which fits into the slot provided in a drawing and measuring device. The drawing and measuring device is provided with a first slidi... | 07/13/1993 |
