Jacob Slager was a son of David Slager and Betje Isaacs.
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Jacob Slager owned a trade in fat and garbage from slaughtering on Roggenstraat 25 in Zwolle from 1900 until 1938.
Kamer van Koophandel Zwolle, inschrijvingsnummer 00918, dossiernummer Historische Centrum Overijssel 0033