Abstract: Ocular perfusion during intraocular surgery of the anterior or posterior ocular cavity is optimized through the method of using a gas pump having a discernible and controllable output pressure to pressurize a reservoir of liquid infusate, which is supplied under pressure to a surgical infusion instrument for perfusion of the selected ocular chamber (Gas Forced Liquid Infusion, GFLI). The infusate selection and the infusate pressure can be controlled with a high degree of accuracy and both can be rapidly varied by audible command. Preferentially a human sensible indication of pressure is constantly available at the gas pump.

Abstract: In a television receiver apparatus is provided for muting an audio power amplifier having continuous operating supply voltage applied thereto from a standby power supply even when the receiver is in an "off" condition so that spurious noise and hum coupled to the power amplifier will not be amplified and heard by the viewer. The muting is applied via a microprocessor controller which controls and senses the power supply status of the receiver as well as mutes the power amplifier in both the "off" and the "on" conditions.

Abstract: Ocular perfusion during intraocular surgery of the anterior or posterior ocular cavity is optimized through the method of using a gas pump having a discernible and controllable output pressure to pressurize a reservoir of liquid infusate, which is supplied under pressure to a surgical infusion instrument for perfusion of the selected ocular chamber (Gas Forced Liquid Infusion, GFLI). The infusate selection and the infusate pressure can be controlled with a high degree of accuracy and both can be rapidly varied by audible command. Preferentially a human sensible indication of pressure is constantly available at the gas pump.

Abstract: A stereo expansion circuit selection switch includes a transmission gate to cross couple the right and left channels as needed for stereo expansion.

Abstract: Apparatus for us in intraocular surgical procedures utilizes a plurality of flexible conduits and a control valve to selectively supply an infusion cannula with either fluid or air. The air and fluid are pressurized for infusion by a continuous infusion air pump and supplied to the valve by parallel lengths of flexible tubing. The apparatus may be used to monitor and control the infusion pressure or to switch the infusion agent in a minimal time.

Abstract: A photographic system is particularly adapted for use in a check security system and offers novel features and advantages for such systems.Such system includes a film cassette and film cassette holder. The film cassette may be molded from plastic parts and can be adapted for assembly and operation without fasteners. The film cassette forms a light tight enclosure with a first opening to admit an image and expose the film within the enclosure and a second opening to permit operation of a film take-up within the cassette. The system includes shutter means adjacent the image-admitting opening of the cassette that can be operated by an actuator carried by the cassette holder. A second actuator carried by the cassette holder can engage and operate the film take-up of the cassette. The cassette can movably carry elements of the system shutter means and provide reliable film take-up and film guidance within the cassette enclosure.