German hexagonal section measuring rod, one of four
1695-1715
Swedish measuring ruler, 28 5/8" long
Ruler
1860-1880
Thornton 12-Inch Rule
1960-1965
Ruler
1875
Twelve inch ruler
1872
Dancer Ruler
1860-1870
Halden Ruler
1870-1900
A.G. Thornton Folding Ruler
1890-1910
Ruler
1917
Ruler
1939
Ruler
1955-1965
Steel Rule
1900
Gardner diesel engines Branded ruler
circa 1954-97
Gardner diesel engines Branded ruler
circa 1954-97
Ruler, plastic
Ruler, used by Beyer
1930
Swedish measuring ruler, 26 7/8" long
Sectional ruler
1900-1910
Ophthalmic Rule
1935-1945
Box of "engine divided" rulers
'Days to check 2000' ruler marketing 'Check 2000' tool
1999
Ruler, wooden, marked 'Armstrong'
Thornton Ruler
1920-1930
Gardner diesel engines Branded ruler
circa 1954-97
Gardner diesel engines Branded ruler
circa 1954-97
Folding rule
1885-1895
German hexagonal section measuring rod, one of four
1715
German hexagonal section measuring rod, one of four
1695-1715
German hexagonal section measuring rod, one of four
1695-1715
Twelve-Inch Ruler
1930-1940
Ruler
1870-1900
Ruler
1949
Ebony ruler, Great Western Railway
1833-1858
Boxwood Ruler, Great Northern Railway
Three ivory rulers
Ebony rule
Ebony ruler
Ruler, Great Northern Railway
1857
Wooden 18" ruler, British Railways
Cardboard Ruler, London & North Western Railway
Ruler from Phase 3 Novavax 2019nCoV-302 Vaccine Trial
2020