2 Vintage Triangle wood 12" rulers for drafting, architecture, engineering

Alvin 244B Drafting Engineer Scale 12” Triangular Ruler W/Case Bamboo Japan Used

Vintage Keuffel & Esser NY 3 Sided Wood Drafting Rulers LOT of 2

Alvin 12" Triangular Drafting Architects Scale Ruler 247, in Case, Boxwood

Alvin 3 Sided Engineer Scale No 119 PC Triangular Drafting Ruler Architect 12"

Alvin 3 Sided Engineer Scale Ruler No 119 PC Triangular Drafting Architect 12"

Vintage Architects Scale Drafting Triangular Rulers Engineer 12" Lot of 3

X10 Lot Architect Scale Rulers 12” Triangular Dietzgel Alvin Staedtler Vtg