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History

The Sealer Beam was designed to fire a ray that closed the opening in the mound of Plasti-Thene and fuse it shut. When its power was reversed, it fired a ray that caused the Plasti-thene to reopen.

The sealer beam was also employed by the Leader to permanently seal the entrance of the living cage where the Hulk was imprisoned in the Los Diablos Missile Base.[1]

Immune to the Leader's mental powers, Betty Ross slipped off and found the Sealer Beam, then she reversed the power on the device and freed the Hulk from his cage.[2]

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