Knox Hydraulic Pump Slide Rule

Chicago citation style
Knox, Inc. Knox Hydraulic Pump Slide Rule. ca 1970. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215000&repo=DPLA. (Accessed November 20, 2018.)
APA citation style
Knox, Inc, (ca 1970) Knox Hydraulic Pump Slide Rule. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215000&repo=DPLA
MLA citation style
Knox, Inc. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215000&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.