1
Gerhard Bruggen, Dieter Karr, Wolfgang Rottler: Non-contacting distance measuring system. Frishauf Holtz Goodman & Woodward, December 24, 1985: US04561064 (39 worldwide citation)

To determine if a pulsed beam system, typically an ultrasonic pulsed beam system, which is located externally of a motor vehicle is in operative condition, a transmitter (14) projects a beam to a fixed reflector (16) located on the vehicle, and one (19) of a group of timing stages (18; 19, 20, 21) e ...


2
Gerhard Bruggen, Dieter Karr, Wolfgang Rottler, Ilan Brauer: Device for measuring the pressure of a gas like medium. Robert Bosch, Michael J Striker, December 16, 1986: US04628739 (10 worldwide citation)

A piezoelectric device for measuring the pressure of a gas like medium comprises two oscillators disposed opposite to each other in a substantially closed system by intermediate introduction of the gas to be measured. The measuring is performed by defining a transfer factor from the first piezoelect ...