Klettersteig is German for 'climbing path' and refers to something more commonly known as Via Ferrata.
Via Ferrata is Italian for 'iron path' and refers to a style of protected climbing route found in the Alps and certain other locations.
The essence of a modern via ferrata is a steel cable which runs along the route and is periodically (every 1 to 10 metres) fixed to the rock. Using a via ferrata kit, climbers can secure themselves to the cable, limiting any fall.
Date of manufacture for your climbing gear is worth recording, especially for ‘soft’ goods like ropes, harnesses, slings and prusiks, as materials can degrade over time. Since the introduction of the PPE laws in Europe manufacturers have been including instructions which give guidance on obsolescence timelines.