Improvements introduced in the object of the main patent n 506.936, by: key security lock. (Machine-translation by Google Translate, not legally binding)

摘要

Key security lock. On the front border of the main body a large washer with the corresponding alvejos of registration for the locks, which are supplied with other analogs practiced in the internal extrem and of less diameter of the own main body. The end of pushing inside the locks, for the zero setting of the lock, is constituted by a series of longitudinal and longitudinal cutting projects provided in the button body, there are as many projects as pitches, so that each one of those shall be constituted into push button for each of such chairs. (Machine-translation by Google Translate, not legally binding)