History
The Atomo-Collar was used on Vison, when he was captured by the Atlantean forces of warlord Attuma. If Vision tried to escape the restraining bonds by altering his molecular agony, Vision was hit by a wave of screaming agony.[1] Attuma later replaced the Atomo-Collar with a smaller Slave-Collar that allowed him to control Vision's mind.[2]
Trivia
In Avengers #154, Attuma controls Vision with the Atomo-Collar. In the following appearance just after that, Super-Villain Team-Up #9, he replaced the Atomo-Collar with Slave-Collars, which he also used on the other, just-captured Avengers. In S-V T-U #9, Attuma mentioned that he had "forged about" the Slave-Collars; that may mean that the Slave-Collars were finished only after Vision's capture, which would explain why Attuma didn't use the Slave-Collar on Vision instead of the Atomo-Collar.