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Boring tool tracking fundamentally based on drill string length, pitch and roll |
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Tension monitoring arrangement and method |
Albert W. Chau, Rudolf Zeller, Charles Yu Yat Tsang |
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Multimode steering and homing system, method and apparatus |
Tim Shaw, Albert W. Chau |
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Rotorcraft autopilot and methods |
Nicholas Albion, Mark Bartel, Marc Feifel, Mark Marvin |
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| 10919622 |
Advanced emergency collective actuator with friction pull-off and method for a helicopter |
Mark Marvin, Derek Paul Vetter |
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| 10901106 |
Distinguishing false signals in cable locating |
Albert W. Chau |
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| 10895145 |
Advanced underground homing system, apparatus and method |
Guenter W. Brune, Albert W. Chau |
2021-01-19 |