X-66140, SECRET Preliminary Instructions for HLAS System per X-66025, Issue 4, Manufactured for the Navy Department, by Western Electric Company : 1943

CONDITION: Minor exterior marks. Fabric spine is split at bottom. Interior clean. marked as copy #20
COMMENTS: Rare technical manual covers a HLAS system. This Secret system appears to be a high intensity loudspeaker system used on ships or ground installations.
APPLICABLE SNL’S:
PUBLICATION DATE: 10/09/1943
SUPERSESSION ISSUE DATE:
POST-PUBLICATION PRINT DATE:
PAGE COUNT: ~150?
FORMAT SIZE (INCHES LxWxH): 10.5x8x.50
INVENTORY CONTROL #: DANA
SKU: 3844
PLEASE CHECK YOUR MANUALS, INSPECT YOUR EQUIPMENT, ASK THE EXPERTS BEFORE BUYING; I DO NOT ACCEPT RETURNS.