Price list of drawing materials, architects and engineers, supplies, blue process papers, etc (1886)
Soltmann, E. G., New York. [from old catalog] · New York, Holt brothers · leaf 112
No. 7180. 7136. 7130. Hard Rubber Spiral Curye each, $1.50 The Spiral Curve contains every curve to the limit of its size. 7135. Hard Rubber Combination Curve each, 2.25 WOODEN CURVES.
Drawing instruments
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
