drum factor
1. In facsimile systems in which drums are used, the ratio of drum length to drum diameter.
2. In facsimile systems in which drums are not used, the ratio of (a) the page width to (b) the page length divided by 
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1. In facsimile systems in which drums are used, the ratio of drum length to drum diameter.
2. In facsimile systems in which drums are not used, the ratio of (a) the page width to (b) the page length divided by .