C-Thru Pocket Slide Rule

Chicago citation style
C-Thru Ruler Company. C-Thru Pocket Slide Rule. 1943-1963. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215009&repo=DPLA. (Accessed November 16, 2018.)
APA citation style
C-Thru Ruler Company, (1943-1963) C-Thru Pocket Slide Rule. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215009&repo=DPLA
MLA citation style
C-Thru Ruler Company. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215009&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.