Abstract: A push button switch which may be used, for example, as a zooming switch in a video camera, having a uniform electrical resistance/applied pressure characteristic and which can be manufactured easily and at a low cost. The switch includes a conductive layer and a pressure-sensitive resistance element disposed between electrode patterns provided on a printed circuit board and an insulated push button. The conductive layer is coated with a pressure-sensitive conductive paste and the pressure-sensitive resistance element is fixed to the insulated push button at a opposed surface to the electrode patterns separated by a predetermined distance.

Abstract: A method and apparatus for processing substances electromagnetically having a container for receiving conductive working pieces and substances to be processed and magnetic field generators located adjacent said container to generate violent random motion of said working pieces is disclosed. The method comprises the steps of operating said apparatus at a first magnetic field intensity level slightly greater than the minimum intensity level required to generate random motion of said working pieces, and then periodically either increasing or decreasing the intensity level from said first intensity level to maintain random motion of said working pieces. Similarly, the apparatus comprises a timing mechanism which periodically either increases or decreases the intensity level from said first intensity level.

Abstract: A glass sheet with broad band receiver antennae and an area to be heated, comprising a glass sheet, a first means provided in the heating area of the glass sheet and capable of functioning both as a heating conductor wire and as a first receiver antennae for receiving waves in predetermined frequency band, an electric source connected to the first means for supplying a heating current to the first means, and a second means provided in an area of the glass sheet other than the heating area and capable of functioning as second receiver antennae for receiving waves in a frequency band different from the frequency band for the first receiver antennae. This glass sheet further includes a stub one end of which is connected to the first means and the other of which to the second means, and a feeder connected to the second means.