2 Architect Engineering Triangular Scale Rulers; Central No. 910 & 912 U.S.ST'D $6.53 USD Sold on: 2017-Mar-23 Marketplace: eBay 3 Treasure 0 Trash 100% Detail: Being offered in this listing are two Architectural Engineering Triangular Scale Rulers; Central No. 910 & 912 U.S.ST'D. These are pre-owned triangular scale rulers. Together, they provide 12 diff... More Relevance Historical Items
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