Image: Patent 6,663
Patent_6,663.jpg (567 × 413 pixels, file size: 62 KB, MIME type: image/jpeg)
Description: Combined Piston Breech, Patent 6,663
Title: Patent 6,663
Credit: http://www.google.com/patents/about?id=kIBFAAAAEBAJ
Author: U.S. Patent Office - inventor Walter Hunt
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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