LowerCaseKey to Platen-Spring. Shift-Keys in both side at forward on keyboard. When?

Not Completed.

When did start?
Remington Type-Writer No. 2 1878? had UpperCaseKey at left-forward on keyboard, LowerCaseKey at right-backward on keyboard.
Remington Standard Type-Writer No. 2 （1882?) had UpperCaseKey at left-forward on Keyboard, and it's the only key to shift the platen?
A patent says like so.

Not Completed.