Sometimes you will see "X or Y" for a family name in Revision or Family lists.  Whether an "or" is missing in this case... You may need to look at the original record.  It may help to look at earlier (or even later) lists if available.
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Paul Hattori
London UK

SHADUR, SADUR, SHADER, SADER, CHADOUR, SADOUR, SHADOUR,  SZADUR from Salakas, Lithuania
MINDEL, MINDELL from Utena and Vyzuonos, Lithuania
FELLER from Pabrade, Lithuania