Abstract: An amplified telephone handset includes a current sensing circuit that senses the polarity of DC voltage supplied from a telephone base, irrespective of whether the DC voltage is of standard or reverse polarity. This feature allows the amplified telephone handset to operate with telephone bases that supply voltages through a telephone cord of either standard or reverse polarity. The amplified telephone handset also includes a voltage detection circuit that detects "off-hook" or "on-hook" states by detecting the absence or presence of the voltage. If a DC voltage is detected, then the amplified telephone handset is coupled to the telephone base and the voltage detection circuit disconnects the battery from receiver and transmitter circuits in the amplified telephone handset, placing the amplified telephone handset in a "on-hook" state.

Abstract: A vehicle body or chassis is raised and lowered on an associated suspension coil spring by a device including a screw, a motor and motor controller, and a gear drive. The device enables adjustment of body or chassis height by the vehicle operator while the vehicle is in motion. Locknuts determine a limited range of adjustment. A particularly advantageous application is adjustment of race cars for specific conditions pertaining to a particular race track or race event. In a preferred embodiment, major components of the device are readily removable from the vehicle, enabling the vehicle to be adjusted prior to a race, then modified to meet, illustratively, NASCAR rules operative during the race.