Rolling rule for typewriter spacing
Rolling parallel rule by Elliott Bros
1870-1910
Rolling parallel rule by Cooke
1922-1950
Parallel rule
1876
Parallel rule
1876
Parallel rule, 18 inch, metal, rolling type
1876
Parallel rule, 18 inch, wood, rolling type
1876
Parallel rule, 6-inch, ivory, rolling type
1876
Rolling rule with 30cm scale and protractor made by Shinomo
1980-1990
Rolling parallel rule by Stanley in brass
1900-1930