Mary Hallock Greenewalt Visibility Project
alexander_mhg
20150324_143353
"Patent on Rheostat." MHG's typewritten description of prior art. Written after her patent; context unclear.
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Uploaded on April 1, 2015
Taken on March 24, 2015
20150324_143353
"Patent on Rheostat." MHG's typewritten description of prior art. Written after her patent; context unclear.
120
views
0
faves
0
comments
Uploaded on April 1, 2015
Taken on March 24, 2015