Abstract: An apparatus for editing digitally recorded audio signals in which entry and exit edit points are designated based on a display of data derived from audio signal data proximate to the edit points. The apparatus enables the automatic selection and combination of portions of audio signals on at last two channels to produce a composite audio signal digitally recorded on a record medium.

Abstract: A method and apparatus is described for performing automatic overlay measurements on wafers utilized in semiconductor manufacturing. The overlay measurements are made at selected sites on a given wafer where a single bar pattern has been overlaid over a double bar pattern. The position of the single bar center line with respect to the center line between the double bars is a direct indication of the overlay error of the two patterns. The overlay error is measured in both the X and Y dimensions and is utilized to monitor the overlay error or to produce statistics and correlations to system parameters so that the sources of overlay errors may be identified and the errors eliminated or minimized on subsequent wafers being processed.

Abstract: A square shaped beam of charged particles is passed over a registration mark in the surface of a semiconductor wafer. A signal produced by a diode detector that is responsive to backscattered electrons will peak when the beam passes over each of the edges of the registration mark. The signal is differentiated; and the resultant signal is filtered and amplified to provide information regarding the position of the beam with respect to the wafer. If more than one diode detector is used, the signals are added just before or just after the differentiation.

Abstract: In abstract, a preferred embodiment of this invention is a device for cleaning gutters without having to use stepladders or other elevating means. This invention is in the form of a novel nozzle used in conjunction with wet/dry vacuum systems.

Abstract: An optical pantograph for directing light beams and the like from a source to a receiver according to the movement of a pointer. The device can be used for, among other things, directing a laser beam and the like to a target for etching patterns on a target according to the movement of a pointer relative to a pattern trace.