Abstract: A keyboard module for avoiding accidental operation keyboard module includes a key unit. The key unit has a pressing portion and a contacting portion. The pressing portion abutted the casing for the key unit not being pressed down. The pressing portion can be raised up to form a pressing distance relative to the casing via a push element controlled by a controlling switch to provide the pressing function. Therefore, the keyboard module can effectively prevent the users accidentally striking unnecessary keys during their operations or when the computer is in a power saving mode.

Abstract: A housing is provided for encasing a video cassette playback machine with selected portions of the machine being accessible through relatively small access openings in the housing to permit restricted operation of the machine. The housing comprises an impact resistant portable carrying case which can be opened for reception of the machine loaded with a selected video cassette and then closed and locked. The carrying case supports a face plate in a position covering the machine control panel wherein one or more access openings are formed in the face plate to permit access to selected machine control devices, such as, for example, the "play" switch, while masking and thus preventing access to other machine control devices, such as, for example, the "record" switch. In one embodiment, a hinged panel is mounted on the inboard side of the face plate and is selectively positioned to open or close access openings in the face plate.

Abstract: A desk top justifying text writing composing machine including automatic encoding and reading control means for operating a desk top justifying reproducing machine, or for operating larger and more sophisticated printing machines capable of automatic justification. The machine will produce unjustified typed lines and will automatically encode for controlling another machine to print justified lines, as a result of a single series of manual keyboard composing operations and automatic code controlled reproducing operations for producing a justified copy of a literal text, respectively. A differential character and space key lock means prevents operation of character and space keys that would extend a line beyond the right hand margin, and this means is appropriately effective to permit the addition of any character or space that will still fit in the line at any given time. The arrangement also accounts for the difference in character sizes for each key in upper and lower case conditions.