Fitzpatrick, Cella, Harper & Scinto
Data processing apparatus
 A data processing apparatus includes a first image signal generating source for sending a first image signal to a printer unit for printing the first image signal; a second image signal generating source for generating a second image signal different from the first image signal, the first image signal generating source being connectable to the second image signal generating source and having a combined image signal output mode for outputting a combined signal of the first and second image signals to the printer unit; and an inhibition unit for inhibiting a change from the combined image signal output mode to another image signal output mode while the printer unit is operating. 
Canon Kabushiki Kaisha
G G G
G06K G06K G06K
inventional additional inventional
Kunio
Okada