Issued by the Department of Public Instruction, State Registration Board for Professional Engineers.
|Place of creation|
|View in library catalog|
Pennsylvania. Department of Public Instruction. “Certificate of Registration for Donald F. Othmer as a Professional Engineer in the Commonwealth of Pennsylvania,” September 19, 1939. Folder 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/x920fw95x.
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