This thread is probably long dead, but on the off chance it isn't ... I am the great grandson of Paul Kachenko who died New Year's Eve in '40. He was married to Anna Estock and fathered Richard and Kenneth. By the 1940 census in April(?), Anna was married to Knox Davenport. Richard and Kenneth took that surname.
Any information would be helpful on the Kachenkos. I do know Julius and his son's were junk peddlers. I would be very interested in 1910 census.