


German hexagonal section measuring rod, one of four
1695-1715

Ruler, plastic

Ruler
1875

Halden Ruler
1870-1900

A.G. Thornton Folding Ruler
1890-1910

Thornton 12-Inch Rule
1960-1965

Gardner diesel engines Branded ruler
circa 1954-97

Gardner diesel engines Branded ruler
circa 1954-97

Dancer Ruler
1860-1870

Ruler
1860-1880

Swedish measuring ruler, 28 5/8" long

Ruler
1955-1965

Steel Rule
1900

Ruler
1939

Ruler, used by Beyer
1930

Ruler
1917

Twelve inch ruler
1872

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

Gardner diesel engines Branded ruler
circa 1954-97

Gardner diesel engines Branded ruler
circa 1954-97

Ophthalmic Rule
1935-1945

Swedish measuring ruler, 26 7/8" long

'Days to check 2000' ruler marketing 'Check 2000' tool
1999

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

Thornton Ruler
1920-1930

Ruler
1949
Ebony ruler, Great Western Railway
1833-1858
Three ivory rulers
Ebony rule
Ebony ruler
Boxwood Ruler, Great Northern Railway
Wooden 18" ruler, British Railways
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