I think the distinction between American and European style is where the key is placed when operating. When operating European style, the key is on the edge of the operating desk and no part of the arm is on the desk. The movement of the forearm not the wrist operates the key. While the key is placed further back on the desk and some part of the forearm is resting on the desk and movement of the wrist operates the key. The knob on a European key is generally higher off the desk than an American key. The Kent key is European style. That does not mean you can not use it American style.