type A/B gangway with BV 1.Aluminm step ladder of fixed type 2..Surface oxidation treatment 3.certificate supply type A/B ... the pier up and down, there are two type of Springboard (type A and type B),Type A is integral springboard, Type B is removable ... portable aluminum ladder, Products comply with CB * 3116-82 standard, With a lightweight, secure , and high intensity.Technical requirements:l All ...