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"Everyone acquainted with the subject will recognize it as a conspicuous failure."
Henry Morton, president of the Stevens Institute of Technology ; Said in 1880 about the light bulb
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| Number | Title | Issue Date |
| 4654977 | Electronic level An electronic level having a horizontal and/or a vertical transducer, each of which exhibits an effective impedance that is a function of the deviation of that transducer from a reference plane. Preferably, each transducer is an electrolytic transducer fo... | 04/07/1987 |
| 4603481 | Bumper indicator A bumper indicator is disclosed which is adapted to be used on the tape rule of a measuring tool. The bumper indicator is a one piece resilient member having front and rear surfaces and a transverse slit whose configuration is selected to be generally com... | 08/05/1986 |
| 4489494 | Tape locking device A retractable tape measure having a casing which contains a coiled tape rule whose free end extends through an opening in the casing and includes means for locking the tape against automatic retraction into the casing. The lock means consists of a locking... | 12/25/1984 |
| 4462160 | Illuminated locking tape measure device An illuminated retractable tape measure has a casing which contains a coiled tape rule whose free end extends through an opening in the casing. A lock arrangement locks the tape against automatic retraction into the casing. In the lock arrangement, a lock... | 07/31/1984 |
