Read this: In the 12th and 13th centuries, Europe produced economic growth and innovations in methods of production. Major technological advances included the invention of the windmill, the first mechanical clocks, the manufacture of distilled spirits, and the use of the astrolabe. Concave spectacles were invented around 1286 by an unknown Italian artisan, probably working in or near Pisa.

Along with the astrolabe, windmill and distilled spirits, what was a notable technological advancement of the 12th and 13th centuries?
What is the answer? (If it cannot be answered, return "unanswerable")
mechanical clocks