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Patents Granted on 1820-09-__
Patents 1 - 5 of 5
First set of recordsLast set of records
3,231XSep. 07, 1820E. WadsworthWeighing machines
3,232XSep. 13, 1820J. HenryConstruction of clocksclockmaker
3,233XSep. 13, 1820J. HenryMode of finding the longitudesurveyor
3,234XSep. 20, 1820R.L. StevensPloughplows or ploughs
3,235XSep. 20, 1820J. Balthorpe (Balltlirope)Double shovel ploughplows or ploughs
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