Patent Drawing of Engine - 001 Sundback zipper 1917 patent Public domain image
Summary
1917 patent of the "separable fastener" (zipper) by Gideon Sundbäck.
Public domain photograph related to motor parts, engines, free to use, no copyright restrictions image - Picryl description
Tags
Date
20/03/1917
Source
USPTO
Link
Copyright info
public domain