Staedtler-Mars 12” Triangular Scale Ruler 987 18-34 Engineer Germany Color Bars

Staedtler-Mars 12” Triangular Scale Ruler 987 18-34 Engineer Japan

Staedtler-Mars 987 18-34 Triangular 12" Scale Ruler Engineer Architect Japan

Staedtler-Mars 987 18-34 Triangular 12" Scale Ruler Engineer Architect Germany

VINTAGE STAEDTLER MARS RULER 987 18-31 ARCHITECT 12' TRIANGULAR SCALE Germany

Staedtler Mars 987 18-31 Architect Triangular Scale Ruler 12" Made in Germany

Vtg Staedtler Mars Engineer 12" Triangular Scale Ruler 987 18-34 Japan

Staedtler-Mars 987 18-34 Engineer Triangular 3 Sided Ruler Colors Japan