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How to Make Patent Drawings Yourself:
Written by two experts in the patent field, this book carefully explains how to create patent drawings that comply with the strict rules of the U.S. Patent Office -- without spending tons of money. It demystifies PTO drawing standards and presents formal drawing instructions for pen and ruler, computer or camera. It also lays out the best ways to respond to PTO examinations.
A perfect companion to Patent It Yourself. [via]