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| The Coast Artillery installed the plotting and switchboard facilities for Battery Const. #404 in a reinforced concrete structure about 400 feet to the south of the gun positions. The installation included the plotting room, switchboard room, (anti-)Chemical Warfare Service, or CWS room, an airlock, a small utility room and latrine facilities. |
| Form 2 | May 1, 1944 |
| Plan | September 1, 1945 |
| Detail map of area. | October 1944 |