Category:United States patent 1179728
English: A "separable attachment plug" patented January 11, 1913 by George P. Knapp; similar to NEMA 10–20 but with different specs (125 V 15 A / 250 V 10 A instead of 125 / 250 V 20 A of NEMA 10–20); it's the ancestor of all I-type connectors.
Media in category "United States patent 1179728"
The following 3 files are in this category, out of 3 total.
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Americanaussieoutlet.jpg 213 × 274; 28 KB
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Au-outlet.jpg 320 × 240; 22 KB
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Au-usa-plug.jpg 645 × 240; 37 KB
