I found your question by Google few days ago. I am a genealogist from Poland. I have researched the family Erdukant for some purpose. I have complete data of them since about 1840 till about 1898 with approximate dates back to the beggining of 19th century and a place of origin.
I set up an account on ancestry.com to contact you. It will be valid till 18 Jan. Please contact me by e-mail firstname.lastname@example.org
(note, there is a figure "1" in it).