... for pressing kinds of concave-convex figures and characters. Equipped with some simple devices, it also can be used for ... : Hunting frequency 27.12MHZ, 30.56MHZ, 40.68MHZ, accord with international standard and little jamming to outside equipments. 3. Fireproof ... protect electron tube and elements. 4. Equipped with auto-positioning system, it is more accurate with little deviation. 5. Large-duty power ...