Abstract: A calibration circuit and method for use with systems of the type displaying values of a measured condition in response to electrical pulses received at the system input in which the repetition rate of the received pulses is representative of the value of the measured condition. Electrical pulses, having a known repetition rate are generated for simulating a value of the measured condition in response to a reference signal of known frequency, the repetition rate of said simulating pulses being determined by the frequency of the reference signal.

Abstract: A mechanical gum massaging device in which the stimulating or massaging element is caused to move (a) in a generally elliptical path, with (b) the plane of said path being substantially perpendicular to the longitudinal axis of the device, and (c) the operative portion of the stimulator element extending outwardly from the device in a direction such that the plane containing said direction and the longitudinal axis of the device is substantially perpendicular to the major axis of said generally elliptical path.