An Historical Look at the Copying Business
Broadly speaking, we have the following five basic photocopying processes in use:
1.Thermo Fax process—The simplest and most widespread process used was developed by Minnesota Mining & Mfg.
2.Transfer-diffusion process—This process is used by American Photocopy, Sperry Rand’s Remington Rand, and others, and is more closely akin to photography, except that no lens is used.











