Joseph Philippus Wassenaar
- Born: 3 Nov 1889, Leiden, , Zuid-Holland, Netherlands
- Marriage (1): Catharina Stafleu on 2 Sep 1914 in Leiden, , Zuid-Holland, Netherlands
- Died: 29 Mar 1975, Amsterdam, , Noord-Holland, Netherlands at age 85
 Noted events in his life were:
• Occupation: Instrumentmaker.
Joseph married Catharina Stafleu, daughter of Willem Frederik Stafleu and Gerritje Hageman, on 2 Sep 1914 in Leiden, , Zuid-Holland, Netherlands. (Catharina Stafleu was born on 16 Nov 1890 in Leiden, , Zuid-Holland, Netherlands and died on 7 Oct 1961 in Amsterdam, , Noord-Holland, Netherlands.)
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