SRPA file LDP758012EL shows a blueprint overview of a Liberty Defense Tower.
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WAR DEPT. GUN TOWER ASSEMBLY
ARLINGTON WICHITA TOWER (TOP VIEW)
APPROVED: 10/20/49 APPROVER:(sig "KYP")
DOC NO.: LDP758012EL
RHY 10/19/49 REV. A
ASSOC. DOC: LDP758986PS