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Class 235/70D - Slide rule pencils


Subclass of Class 235 - Registers
No. of patents: 1
Last issue date: 08/02/1977


NumberTitleIssue Date
4039819Combined writing instrument and slide rule
An elongated transluscent plastic cylindrical member has a mechanical pencil formed at one end and has a longitudinally directed ridge projecting radially from the member on which are located first slide rule scales. A longitudinally slotted transluscent ...
08/02/1977
 
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