Rule, Slide
Wooden rule with sliding block that can be locked down with a twisting knob. The block is marked with a moustache-like symbol. Small text reads: “Patn Aug 5, 1873” and “GR. DAVIDSON”
Wooden rule with sliding block that can be locked down with a twisting knob. The block is marked with a moustache-like symbol. Small text reads: “Patn Aug 5, 1873” and “GR. DAVIDSON”