1
Douglas R Thornton: Multiterminal monitoring system. Manitou Systems, Neuman Williams Anderson & Olson, December 14, 1976: US03997873 (72 worldwide citation)

Apparatus for controlling and recording the use of a plurality of photocopiers are disclosed. The apparatus includes a terminal associated with each of the photocopiers and a central recorder connected to each of the terminals. Each authorized user of the photocopiers is issued a badge having user i ...


2
Douglas R Thornton, Jerome Smiglee: Line-seizing apparatus. Manitou Systems, Neuman Williams Anderson & Olson, October 25, 1977: US04055835 (6 worldwide citation)

Line-seizing circuitry is disclosed by which a plurality of remote terminals may be connected to a central data recorder over a single two-wire data line with only one terminal being in communication with the recorder at any one time. Tie-breaking circuitry is included to prevent two remote units fr ...