Image: Beckman Model 735 Dissolved O2 Analyzer 2012 002 3598 jm214p459 cropf

Description: Beckman Model 735 Dissolved Oxygen Analyzer Developed from a Linus Pauling design during WWII, the technology behind Beckman Instruments’ oxygen analyzers ended up doing such diverse jobs as monitoring astronauts’ respiration, maintaining packaged food safety, and preventing blindness in newborn babies. Published without a copyright notice in Beckman Instruments Feedback newsletter, v11 n2, May 1968 (box 45, folder 1)
Title: Beckman Model 735 Dissolved O2 Analyzer
Credit: https://digital.sciencehistory.org/works/v118rd71c
Author: Beckman Instruments Photographic Services Section
Permission: This work is in the public domain in the United States because it was published in the United States between 1928 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No