The fact that both Mary Kenner and her sister Mildred Davidson Smith held United States patents is not a footnote to the story of Mary Kenner — it is one of the most revealing details in the entire account.

Mildred’s patent was U.S.

Patent 3,521,902, granted in 1970 for a game: a family board and card game she had designed.

The game patent is a different category from Mary’s practical invention patents, but it is a patent nonetheless — a documented, legal acknowledgment that Mildred Davidson Smith had created something novel and worthy of protection.

Two daughters of Sidney Davidson, who himself held a patent.

Three patents across two generations of a single family.