There are directories out there but finding them for the war years will be
next to impossible. The National Library in Prague has copies for 1925 and
1926:

Adresár mesta Košic = Košice város címjegyzék
Boehnel, Richard
Košice : Stát. kníhtl.,
1925

Regards,
Gabi

Gabriela Svatos
Richmond Hill, Ontario
E-mail: gsvatos@hotmail.com
Business E-mail: bookstore@agawa.com
Business URL: www.abe.com/home/GSVATOS