The simple beginnings of modern duplicators are to be seen in the British Museum. There are exampies of hand rotary duplicators believed to have been in use as early as 1,000 B.C. They consist of engraved cylinders of stone and were operated by being rolled over slabs of soft clay which were subsequently dried in the sun. This elementary apparatus serves to indicate that the need for duplication has existed since man first began to record. The high speed rotary machines of to‐day are the result of his ingenuity to meet that growing requirement.
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