Excerpt from Instructions for the Use of A. W. Faber "Castell" Precision Calculating Rules
The slide consists of a Strip of wood also reinforced by metal in a similar manner to the body of the rule, and arranged with a tongue on each side, which tongues accurately fit the grooves along the inside of the rule body.
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Seller: PBShop.store US, Wood Dale, IL, U.S.A.
HRD. Condition: New. New Book. Shipped from UK. Established seller since 2000. Seller Inventory # LX-9780265784334
Seller: PBShop.store UK, Fairford, GLOS, United Kingdom
HRD. Condition: New. New Book. Shipped from UK. Established seller since 2000. Seller Inventory # LX-9780265784334
Quantity: 15 available