Vintage Alvin No. 241 P Engineer Triangular 12" Scale & One Unbranded

Vintage Alvin No. 241 P Engineer Triangular 12" Scale

Engineers 12” Triangular Scale No. 241P Germany

Vintage Alvin Triangular Scale Ruler 241P Drafting Engineer 12"

Vintage Alvin #241 Engine Divided 12" Triangular Boxwood Drafting West Germany

Alvin 3 Sided Engineer Scale No 119 PC Triangular Drafting Ruler W-Germany

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