Trap doors

کتابخانه الکترونیکی دیتا ساینس شناسه: BS EN 81-50:2014 عنوان: Safety rules for the construction and installation of lifts. Examinations and tests. Design rules, calculations, examinations and tests of lift components (بیشتر…)

کتابخانه الکترونیکی DataScience شناسه : BS EN 81-20:2014 عنوان : Safety rules for the construction and installation of lifts. Lifts for the transport of persons and goods. Passenger and goods passenger lifts (بیشتر…)