


Swedish measuring ruler, 28 5/8" long

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

Ruler
1955-1965

Steel Rule
1900

Gardner diesel engines Branded ruler
circa 1954-97

Gardner diesel engines Branded ruler
circa 1954-97

Ruler
1860-1880

Ruler, plastic

Thornton 12-Inch Rule
1960-1965

Ruler
1875

Twelve inch ruler
1872

Dancer Ruler
1860-1870

Ruler, used by Beyer
1930

Halden Ruler
1870-1900

A.G. Thornton Folding Ruler
1890-1910

Ruler
1917

Ruler
1939

Ophthalmic Rule
1935-1945

Swedish measuring ruler, 26 7/8" long

Sectional ruler
1900-1910

Box of "engine divided" rulers

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

Ruler, wooden, marked 'Armstrong'

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

Thornton Ruler
1920-1930

Gardner diesel engines Branded ruler
circa 1954-97

Gardner diesel engines Branded ruler
circa 1954-97

Folding rule
1885-1895

Ruler
1870-1900

Ruler
1949
Ebony ruler, Great Western Railway
1833-1858
Ebony ruler
Ebony rule
Boxwood Ruler, Great Northern Railway
Three ivory rulers
Ruler, Great Northern Railway
1857
Wooden 18" ruler, British Railways
Cardboard Ruler, London & North Western Railway
Timetable slide ruler
Wooden ruler, Great Western Railway
Ruler from Phase 3 Novavax 2019nCoV-302 Vaccine Trial
2020