Alvin 6 Plastic Engineer Triangular Scale Set

Alvin 610E 6 in. High Impact Plastic Engineer Triangular Scale

Alvin 111P 12 in. High Impact Plastic Engineer Triangular Scale

Architects Corner Los Angeles. Alumicolor Architecture Scales

Professional Triangular Scale Engineering 12 Inch Staedtler Mars Engineering Ruler Solid White Plastic Drafting Scales

Vintage ALVIN Professional Plastic Triangular Scale Engineer 241 P W.- Germany

Alvin Professional Triangular Scales

Alumicolor 6-in Pocket Engineer Scale Silver

Alvin 610E 6 in. High Impact Plastic Engineer Triangular Scale

Alvin 6 Smoke-Tint Triangle 30/60