Quantity: 1 available
3 x 8 1/2" sliding rule made of cardboard. Folder of instructions well worn. Plastic pocket card.
Dimensions given, if any, are approximate. Item complete as issued. VG or better condition. Defects not visible in scan[s] are described.
Title: Ballantine Laboratories Rule DB-Ratio Conversion 1953 w/ folder & card
Item: 0.50 Item
Seller ID: 1435774