
Pedometer by Spencer and Perkins
1775-1800
1775-1800
1775-1794
1755
1853
1880-1920
1835-1845
1835-1845
1775-1794
1775-1794
1799-1805
1795-1805
1780
1799
1775-1806
1682-1720
1831-1860
1701-1750
1788
1800
circa 1800
1795-1806
1982-1984
1754
1775-1799
1801-1900
1928
early 21 century
1927
1877
1895-1905
1980-2000
1900-1920
1980-2000
1980-2000
1915-1925
1905-1915
1903
1903
1940-1960
1940-1960