Steute is a manufacturer of industrial controls which was founded in 1961. They have a series of safety switches which have had a part number change. Digi-Key carries the latest replacements for these.
22.214.171.124.02, 01 is one of the part numbers that might be found marked on an older switch. This has been replaced by 1182987. This item is not readily available and requires a 5 pcs minimum purchase at Digi-Key. 1048069 is a stocking solution with some minor differences that may serve as a suitable alternative.
If there are any questions on this, please reply to this post and we will be happy to address them.