Abstract: A copying apparatus of portable type having an image reader for reading an image of a document, a memory for storing image data obtained by the image reader, a printer for printing out the image of the document read out by the image reader according to the image data stored in the memory and a processor for controlling the image reader and the printer wherein upper and lower blank lines are searched for with respect to each of partial images divided from the whole image stored in the memory. Image data except for the image data existing in an area defined between the upper and lower blank lines which have been found by respective blank line search, are erased upon printing.

Abstract: An optical displacement measuring system utilizing a triangulation is so arranged that light receiving means receives light reflected back from an object to be measured and generates a pair of output signals having mutually opposite values and responsive to a position of a light spot on the light receiving means. An operational means performs addition and subtraction over the pair of positional output signals and to obtain a ratio between the both added and subtracted output signals for generating a measured distance signal, and a linearity correcting means provides a mathematical correction number to one of the pair of positional output signals to correct any nonlinearity of the measured distance signal, for providing the linearity to the measured distance signal with a simple arrangement.

Abstract: A memory module is provided for read/writing a program. The memory module is connected to a programmable device including a programmable electronic calculator, a personal computer, a computer, or a word processing device such as a word processor and a language dictionary. A switch is provided for selectively supplying read/write control signals to the memory module. The memory module includes a plurality of memory areas which may be selectively disconnected from the read/write control signals to prevent reading/writing therein.

Abstract: A lever operating device in an excavator comprises an accelerator arm interlocked with an accelerator lever to pivot fore-and-aft, a pivotable arm interlocked with a control lever for a controlling valve of a drive unit in a working section to pivot fore-and-aft, a machine frame which bears the accelerator arm and pivotable arm arranged left and right in parallel and an abutting plate provided integrally with the accelerator arm to extend to the pivotable arm side, whereby the extending end of the abutting plate is located in the front position in the pivotal direction of turning on the controlling valve of the pivotable arm.

Abstract: An intrusion warning system for indicating the presence of an intruder to a given area includes an antenna provided around the area and which is insulated from the ground. An oscillator is provided for feeding an alternating current signal to the antenna, and a coupling impedance is connected between an output of the oscillator and the antenna. The coupling impedance includes an arrangement to vary the impedance to an appropriate value such that the voltage fed to the antenna is approximately 50% of the voltage fed from the oscillator to the coupling impedance. By this arrangement the detection sensitivity is always kept at an optimum. The system also includes a signal processing apparatus for producing an output signal responsive to a change in the voltage of the alternating current on the antenna exceeding a predetermined level.

Abstract: An intrusion warning system for indicating the presence of an intruder to a given area comprises a single antenna line encircling the area insulated from the ground, a high frequency oscillator (e.g. of 1 kHz to 10 kHz) for feeding a high frequency signal to the antenna, a coupling impedance, for example, a capacitor, connected between the output terminal of the oscillator and the antenna, and a signal processing part which produces an alarm when detecting a voltage change over a predetermined level of the antenna induced by a proximation of the intruder.