Abstract: A static megasonic cleaning system for cleaning multiple objects having an exterior surface includes a cassetteless vessel having an internal cavity for receiving the multiple objects and an array of megasonic transducers mounted on the vessel. Each transducer emits a focused beam of megasonic energy into the cavity and is arranged so that the emitted beams from all of the transducers collectively envelop the entire exterior surface of the objects. The transducers are staggered to avoid internal mounting structure within the vessel and avoid unnecessary dissipation of the megasonic energy.

Abstract: Apparatus for demonstrating the use of a computer terminal comprises a projection module supported on a standard overhead projector. The projection module includes a frame which is adapted to rest on an illumination window of the overhead projector. A transmissive liquid crystal display is mounted in the frame parallel to the illumination window such that an image on said liquid crystal display is projected by the projector. A transparent touch screen is also mounted in the frame overlaying the liquid crystal display. By means of a stylus, a user touches the touch screen and thereby designates desired text and/or images for subsequent display. Coupled to the decoder is a computer which retrieves the desired text and/or images which are then transmitted to a display driver. The aforesaid apparatus is most suited to demonstrate a computer terminal which has a touch screen for selecting text and/or images for display.

Abstract: High speed printing endorsing apparatus of modular construction capable of automatically printing both fixed and variable information simultaneously upon items fed to said apparatus in a continuous uninterrupted stream of items. Differential gearing and a wrap spring clutch in combination with a cam and follower concentric with the main drive shaft of the apparatus provide means for automatic item batch consecutive number advance by means of relative motion between the cam the printing apparatus. The item batch printing device is demountably removable permitting alteration of the fixed information while the vertical position of the batch printing relative to the item information field format is alterable at will. Automatic means is provided for loading and unloading the print head inking assembly against the print head so as to avoid any bleeding of the inking mechanism when not in use.

Abstract: In order to reduce the noise resulting from the act of printing in a typewriter or line printer, the hammer is oscillated at high frequency with low power pulses, and the oscillating hammer is moved into proximity to the inked ribbon whereby the hammer repetitively impacts the ribbon in order to print one character.