| Patent Number |
Title Of Patent |
Date Issued |
| D252950 |
Lightweight trench box |
September 18, 1979 |
|
| 4402213 |
Method and device for detecting and locating leaks in pipelines |
September 6, 1983 |
| A device for locating leaks in a pipe includes a leak locator probe (139) that is suitable for being transported along a length of pipe. The leak locator probe (139) includes a tube (148) that is closed at one end and open at the other end. An aperture (126) provides an air flow passagew |
| 4375763 |
Device for detecting and locating leaks in pipelines |
March 8, 1983 |
| A device and method for locating leaks in a pipe are provided. A leak locator probe (10) is provided and is suitable for being transported along a length of pipe. The leak locator probe (10) defines an annular volume (24) within that portion of pipe adjacent the leak locator probe (10). |
| 4247809 |
Electrical levelling system for laser beam |
January 27, 1981 |
| A laser generating tube and associated optical system is mounted on a laser support which is mounted to pivot relative to a cradle about a first axis. The cradle is mounted to pivot about a second axis (transverse to the first) relative to a frame. First and second levelling motors contr |
| 4119382 |
Self-leveling construction alignment laser |
October 10, 1978 |
| The specification discloses an improved system for projecting and utilizing a light beam as a reference line for construction purposes. The system includes a light beam projection device mounted in a housing. A light path compensator is positioned within the housing and intercepts the be |
| 4053238 |
Self-leveling construction alignment laser |
October 11, 1977 |
| The specification discloses an improved system for projecting and utilizing a light beam as a reference line for construction purposes. The system includes a light beam projection device mounted in a housing. A light path compensator is positioned within the housing and intercepts the be |
| 4043679 |
Self-leveling construction alignment laser |
August 23, 1977 |
| The specification discloses an improved system for projecting and utilizing a light beam as a reference line for construction purposes. The system includes a light beam projection device mounted in a housing. A light path compensator is positioned within the housing and intercepts the be |
