Robert Francis Gilbreth
1885 - 1970 (85 years)(
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- 1 Robert Francis Gilbreth [1] b. 22 Jun 1885 d. 8 Jul 1970
- + Martha May Zachary b. 17 Dec 1876 d. 12 Sep 1946
- + Martha May Zachary b. 17 Dec 1876 d. 12 Sep 1946