Arbeitsbuch - Gelsenkirchen coal miner

1st edition Arbeitsbuch issued to Karl Tusk (unsure of the exact spelling of his family name, difficult to read) in December 1935. He was born in December 1893 in the industrial city of Gelsenkirchen. This city was fairly well known for its coal mining industry. The stamps and entries indicate that he worked for a prominent mining company called Gelsenkirchener Bergwerks A.G. from late 1937 to April 1945. Interesting that they even specify the exact coal mine / pit that he worked in (Zeche Bonifacius).