Final answer:
Manufacturers, distributors, and dealers of ETHER must keep records for a minimum period of 2 years for regulatory compliance and monitoring.
Step-by-step explanation:
According to the regulations enforced by various governmental drug enforcement agencies, the records and sales of ETHER by manufacturers, distributors, and dealers are typically required to be kept for a minimum period of 2 years. This is to ensure compliance with legal and regulatory requirements concerning the control and monitoring of substances that have the potential for abuse or are considered controlled substances. It is crucial for entities handling ETHER to maintain proper documentation to avoid legal issues.