Explanatory notes
… Articles of heading 84.12 constructed to work without an escapement; (f) Ball bearings (heading 84.82); or … the bridges. The plate, to which the bridges are fixed by screws and pins, is the basic support of the movement. Some … opposite outer plane, without taking account of any screws, nuts or other fixed parts projecting beyond that …Legal note
… Articles of heading 84.12 constructed to work without an escapement; (f) Ball bearings (heading 84.82); or …