Inventor Johnson, William
Invention Level and clinometer, Pendulum
Residence Edisto Island
Dated 4/25/1871
Patent 114014
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US Patent Office Record http://patft1.uspto.gov/netacgi/nph-Parser?patentnumber=0114014
Local Copy of Patent Docs http://library.clemson.edu/scpatimages/index.php?pn=114014