Folks,
You help proofreading the new manual online would be appreciated:
Twin 20-mm Antiaircraft Assemblies, OP 1439, 1945, is a Navy service manual for the twin mount version of the classic WW II anti-aircraft gun on the tripod style mount. Note this is also the version that was added to the submarines near the end of the war.
http://hnsa.org/doc/gun20twin/index.htmrich
