Can you let us know how 140 revoke process works?
Do employers apply for revoking 140 just like they apply for new 140?
What exactly does USCIS do and how long is the processing time?
This will help employees to switch jobs and delay the informing their employers as much as possible
General I-140 
140 Revoke process
140 Revoke process
140 Revoke process
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