context: The cottage hazard shaft (383 m) was completed in 1939 and had a passenger and freight elevator. The lift machine was a drum machine with a diameter of 3.16 meters, a speed of 5m / s and a counterweight of 5.5tn and a lift of 4.5tn. The tomb was used to lift the sidewalk. In the final stages, the shaft served as a ventilation shaft, and Mökivaara was the central concrete station for the mine.
question: When was the Mökivaara mine established?
answers.text: 1939