Need help with H1 extn based on 140

GCBy2010

Registered Users (C)
H1 extensions are allowed for 3 years if 140 is approved and priority date is not current. Does this also apply when the 485 is pending and the visa dates are not current ?

Can someone help me provide the official USCIS memo or URL that points to the above statement.
 
If your I-485 is pending, the H1B extensions are done on an annual basis - only 1 year extensions. I've been doing this for 2 extensions already.
 
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