Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search help
5 results
  1. NLM Digital Collections - Human factors in military efficiency (Volume 2) 
    Publication: Washington, D.C. : Office of Scientific Research and Development, National Defense Research Committee, Applied Psychology Panel, 1946
    resource.nlm.nih.gov/14030580RX2
    ... appeared on a 5-inch oscillo- scope, the actual indicator unit of a long-range search set. Strong ...