Image: Beckman D2 Oxygen Analyzer 2012 002 5132 cn69m4659f

Description: D2 Oxygen Analyzer for Safe Oxygen Therapy 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. Product Data Sheet O2—8120, Beckman Instruments, Circa 1950s. No copyright statement. No copyright renewals.
Title: D2 Oxygen Analyzer for Safe Oxygen Therapy
Credit: https://digital.sciencehistory.org/works/4t64gn590
Author: UnknownUnknown
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