# Ottmar Mergenthaler, at approximately 45 years old

- By: Adam Cuerden
- Date: before 28 October 1899 (published 1912, but that's when Mergenthaler died)
- Classification: Photograph
- Credit line: Johns Hopkins University
- Museum: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Ottmar_Mergenthaler,_at_approximately_45_years_old.jpg)
- Rights: Public domain
- Picture: https://invisiblenetwork.ai/thumbs/commons/thumb/2/2b/Ottmar_Mergenthaler%2C_at_approximately_45_years_old.jpg/1920px-Ottmar_Mergenthaler%2C_at_approximately_45_years_old.jpg
- Who can see it: Kids profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)

Ottmar Mergenthaler, at approximately 45 years old (the age he died). Per File:OttmarMergenthaler.jpg this was published in 1912 in Iles, George (1912). Leading American Inventors. New York: Henry Holt & Company, p. 392