Original PM 12 / Model 12 submachine guns featured separate manual safety and fire mode selector, both being made in the form of the cross-bolt buttons.
原件日下午12 / 12型冲锋枪功能的单独的手动安全和消防模式选择，无论是在形式的跨螺栓按钮了。
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Although these buttons are useless to the average person, they do perform their proper function for fire fighters and maintenance workers but only with a code or designated keys.