Resilion locking brake lever was introduced in 1948, as a way to curb bicycle theft. It looks like bicycle theft as long been an issue, not just in these modern times.
It is a novel design, squeeze the lever then turn the key to lock it in place. The brake pads hold tightly to the rim after the key is removed making the bicycle immovable. Aluminum construction.
|from – http://sadabonne.cocolog-nifty.com/blog/2012/02/resilion-brake-.html|