milled slot: US3085264A - Screw shank slotting machine with clamp carrying ... . Sản Phẩm Hãng VTZ. Liên hệ - Công ty TNHH Thiết kế Xây dựng TM Long Vĩnh.
A double slotted screw drive is not considered cruciform because the shape is not recessed, and consists only of two superimposed simple milled
slots.