Relay Unit RE-22/ARW-9 of AN/ARW-10A Airborne Remote Control Bomb Release System BOXED C-130 Do your own research to

Do your own research to confirm

This is a fine example of an WWII-era Suction Gage

set zero of scale on rear index (G)

From https://1250scale

Relay Unit RE-22/ARW-9 of AN/ARW-10A Airborne Remote Control Bomb Release System BOXED C-130 Do your own research toThe AN ARW 10A Airborne Remote Control Bomb Release System was developed during WWII but did not see active use until the Korean War. The system was designed to release bombs simultaneously from all planes in a formation, usually twelve, by a single bombardier in the lead aircraft. Three pages in the photo gallery explain the system in greater detail. During WWII, bombardiers often released their bombs manually upon observing the drop of the lead