Abstract: An optical instrument which operates with an incident optical beam scanned at high rates and with correspondingly small sized scanning devices, has a double-scanning optical system. The output reflected beam that is detected overfills the first-stage scanning element, yet the instrument attains a relatively high-contrast image. The instrument provides for astigmatism correction, graphic generation in the scanned beam, and the use of infrared wavelength laser beams as well as visible wavelength laser beams. It also provides for generating system timing pulses from a rotating scanning element.

Abstract: An air supply system includes an air accelerating chamber formed by truncated conical intake and exhaust ducts joined at the truncated ends to be coaxial. The system also includes a fan impeller having a hollow cylindrical hub with impeller blades on the outer periphery and is rotatably mounted in the exhaust duct to provide a first accelerated air stream passing between the exhaust duct and hub, and a second accelerated air stream passing through the hub. Pressurized gas, such as combustion gases from an internal combustion fan drive, can be admitted to the intake duct to produce swirl, and additional impeller blades can be provided in the interior of the hub to further accelerate the second air stream.

Abstract: A locking device for garage door actuator signal transmission devices having a housing in which a signal transmission means is mounted, and into the circuit of which is installed normally open switches, with means for simultaneously manually operated separate actuators closing the said normally open switches actuating the door and for automatically opening said normally open switches upon release of said closing means, breaking the circuit through said main switch.

Abstract: An inflation guide for permanent mounting on a tire valve for preventing over inflation of the tire.

Abstract: An attachment for telephones using direct dialing mechanism, or the push button type, which may be selectively moved to one position to prevent the user from completing a direct dial long distance call, and into another position that will prevent such calls by interrupting the service when the user attempts to dial the Operator.