Inventor Davega, Columbia
Invention Audiophone
Residence Charleston
Dated 3/8/1881
Patent 238,576
Class 181/127
Assign *
US Patent Office Record http://patft1.uspto.gov/netacgi/nph-Parser?patentnumber=0238576
Local Copy of Patent Docs http://library.clemson.edu/scpatimages/index.php?pn=238576