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| Jacob Barend Viskoper, birth 8 Dec 1789 Amsterdam, circumsicion in Amsterdam 27 Kislew 5550 (15-12-1789) "J'ak ben Berman Fisjman", died 5 Nov 1880 Amsterdam, occupation: coster, fishbuyer, son of Barend Jonas Hakker and Clara Moses (Klaartje) Kloot Married 16 Jan 1822 Amsterdam to: Esther Isaac Visschel, birth 1802 Amsterdam, died 27 May 1866 Amsterdam, daughter of Isaac Nathan Visschel and Rachel Emanuel Gobetz | 
| 1) Rachel Jacob Viskoper, birth 22 May 1824 Amsterdam, died 27 Jan 1905 Amsterdam, buried 28 Jan 1905 Amsterdam on Zeeburg (field C) Married 5 Jul 1840 Amsterdam to: Jochem Benedictus Bak, birth 1811 Amsterdam, died 3 Aug 1884 Amsterdam, buried 5 Aug 1884 Amsterdam on Zeeburg (field C row 4 grave 53), occupation: diamantcutter, son of Benedictus Joseph Bak and Beeltje Zaal Souel Jochem was widower of Hendrica Nathan de Vries. | 
| 2) Barend Jacob Viskoper, birth 28 Jun 1826 Amsterdam He left Amsterdam before 1850. | 
| 3) Rachel Jacob Viskoper, birth 12 Jan 1829 Amsterdam, died 3 Feb 1909 Amsterdam Married 27 Oct 1858 Amsterdam to: Simon Hartog Korper, birth 13 Mar 1835 Amsterdam, died 30 Aug 1866 Amsterdam, occupation: coster, son of Simon Korper and Leentje Hartog Broekwasser | 
| 4) Mozes Jacob Viskoper, birth 10 Aug 1831 Amsterdam, died 15 Feb 1916 Amsterdam, occupation: merchant, coster of fish, fishmerchant, porter Married 13 Aug 1856 Amsterdam to: Rebecca Machiel Trijtel, birth 3 Jul 1833 Amsterdam, died 7 Nov 1910 Amsterdam, daughter of Machiel Samuel Trijtel and Ester Barugh | 
| 5) Klara Jacob Viskoper, birth 5 Apr 1836 Amsterdam, died 3 Aug 1919 Amsterdam Married 4 Feb 1857 Amsterdam to: Salomon Isaac Pront, birth 13 Apr 1836 Amsterdam, died 25 Feb 1880 Amsterdam, occupation: workman, coster, son of Isaac Wolf Pront and Jannetje Duits | 
| 6) Saartje Jacob Viskoper, birth 9 Aug 1839 Amsterdam, died 29 Sep 1920 Amsterdam Married 17 Oct 1866 Amsterdam to: Samuel David Victors, birth 23 Aug 1839 Amsterdam, died ± 22 May 1924 Amsterdam, son of David Victors and Saartje de Jager | 
| 7) Isaac Jacob Viskoper, birth 29 May 1842 Amsterdam, died 30 Dec 1843 Amsterdam | 
| 8) Femmina Jacob (Wimmetje) Viskoper, birth 17 Nov 1844 Amsterdam, died 4 Mar 1925 Amsterdam Married 17 Feb 1869 Amsterdam, synagogue Amsterdam 15-08-1869 "Froemet bat Ja'acow Hakker and Selig also mentioned Pinchas ben Aharon Engelsman" to: Salomon Aron Engelsman, birth 18 Jan 1846 Amsterdam, died 8 Feb 1897 Amsterdam, occupation: porter, son of Aron Joseph Engelsman and Betje Lever |