Ladew Belting Strength Computer Circular Slide Rule by Whitehead and Hoag

Chicago citation style
Whitehead & Hoag Company. Ladew Belting Strength Computer Circular Slide Rule by Whitehead and Hoag. 1914-1920. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215006&repo=DPLA. (Accessed November 20, 2018.)
APA citation style
Whitehead & Hoag Company, (1914-1920) Ladew Belting Strength Computer Circular Slide Rule by Whitehead and Hoag. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215006&repo=DPLA
MLA citation style
Whitehead & Hoag Company. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215006&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.