Visually striking, these vintage patent prints feature sketches of a helicopter.This patent design is also available in Blackboard, Blueprint, and Parchment styles. Choose from sizes that run from 5x7 inches all the way to 18x24 inches.
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These patent designs are available as PDF files, or high resolution JPG files.
The PDF versions can be viewed and printed in any program that can display the .PDF file format.The JPG versions can be opened for edit and print in many image editors
All patent designs are optimized for printing at 300 DPI. To print a full-size poster, read our quick and easy guide.
Also available: thousands more free printables including
Constitution and founding documents,
planner pages and
Games and Entertainment Patents
Home Appliances Patents
Musical Instruments Patents
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