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