Inventor Childs, David A.
Invention Key Operating Device
Residence Columbia
Dated 3/1/1887
Patent 358,649
Class 70/393
Assign *
US Patent Office Record http://patft1.uspto.gov/netacgi/nph-Parser?patentnumber=0358649
Local Copy of Patent Docs http://library.clemson.edu/scpatimages/index.php?pn=358649