- Born: 11 Apr 1889, Bjerresø, Vallekilde Sogn, Ods Herred, Holbæk Amt 16996,39406
- Christened: 23 Jun 1889, Vallekilde Kirke 16996
- Marriage (1): Martha Nicoline Mortensen on 26 Apr 1914 in Nørre Jernløse Kirke
- Died: 28 Jul 1969, Solgården, Vor Frue Sogn, Kalundborg, Ars Herred, Holbæk Amt at age 80 39406
- Buried: 31 Jul 1969, Sankt Olai Kirkegård, Kalundborg 39406
 Other names for Karl were Carl Alfred Bertelsen and Karl Alfred Berthelsen.
Karl married Martha Nicoline Mortensen, daughter of Hans Peter Mortensen and Ane Marie Sofie Sørensen, on 26 Apr 1914 in Nørre Jernløse Kirke. (Martha Nicoline Mortensen was born on 31 Mar 1888 in Sønder Jernløse Sogn, Merløse Herred, Holbæk Amt 39407,39408, christened on 27 Apr 1888 in Sønder Jernløse Kirke,39407 died on 29 May 1947 in Bjergsted Sogn, Skippinge Herred, Holbæk Amt 39408 and was buried on 3 Jun 1947 in Bregninge Kirkegård, Holbæk Amt 39408.)
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