Perrygraf Metalcutting Slide Rule for Dreis & Krump

Chicago citation style
Perry Graf Corporation. Perrygraf Metalcutting Slide Rule for Dreis & Krump. 1944. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215005&repo=DPLA. (Accessed November 18, 2018.)
APA citation style
Perry Graf Corporation, (1944) Perrygraf Metalcutting Slide Rule for Dreis & Krump. Retrieved from the Digital Public Library of America, http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215005&repo=DPLA
MLA citation style
Perry Graf Corporation. Retrieved from the Digital Public Library of America <http://collections.si.edu/search/results.htm?q=record_ID%3Anmah_1215005&repo=DPLA>.
Note: These citations are programmatically generated and may be incomplete.