Hickok Paper-Ruling Machines, Automatic Paper Feeders [and] Ruling Pens and Inks Catalog No. 89. (Harrisburg, PA: The W. O. Hickok Mfg. Co., n.d. )
Thanks are due to David Krenz for allowing the digitization of this copy. The icon at left links to a presentation of this digitization at The Internet Archive. Here is a local copy of the PDF (392 Megabytes): hickok-paper-ruling-machines-1933-dk-0600rgbjpg.pdf
Hickok Catalog No. 89 was published in the US without copyright notice at a time when such notice was required to secure copyright. It therefore passed into the public domain upon initial publication. This digital reprint remains in the public domain.
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