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This isn't a warded lock, it's a single lever lock. Please see discussion at Commons on the image page. Andy Dingley (talk) 10:33, 17 March 2011 (UTC)[reply]
About warded lock. Very common in roman period.,[edit]
I have deleted this sentence:
Next, the warded lock was invented in China.[citation needed] In the Middle Ages, it came to Europe.
It is false. Numerous ancient findings of roman period are present in museums around Europe.
Only an example here: Bronzi antichi del Museo archeologico di Padova
Di Girolamo Zampieri,Padua (Italy). Museo archeologico p.185 ss There are numerous examples of I-II centuries CE.
For multi lever lock very interesting see key examples 350, 356, 363 but however there are also others numerous examples. In Altino near a key it was found also a coil spring.