I also found the same information for
JAMES W VONBRUNN
413 TRIPPE AVE
EASTON MD 21601
born july 11, 1920
at the Maryland website—
http://www.mdelections.umd.edu/voter-registration/status/
The reason his voter registration was invalid is that he likely no longer lived at the 413 Trippe Ave address.
Zabasearch shows Von Brunn also living at:
JAMES W VONBRUNN Born 1920
1200 WASHINGTON ST
EASTON, MD 21601
So if 1200 Washington St is his current address, that could invalidate his voter registration at the 413 TRIPPE AVE address
His most recent address:
James Wenneker vonBrunn
616 Admiral Dr Apt 351
Annapolis, MD 21401-7520