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ECR
+++++ Engineering Change Request
++++- electron cyclotron resonance
+---- effective cleaning radius
AcroLexic: Dictionary of Acronyms and Abbreviations contains 17 more definitions of “ECR”.
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See also

Acronym Definitions
SECR 3
ECRS 2
ECRA 2
ECRIS 2
ECRC 2
DECR 2
ECRB 1
ECRL 1