Distapohn S. PRODUCT DESIGN FOR PHYSICALLY FACILITATE THE ELDERLY DEVICE TO HELP WALK UP AND DOWN STAIRS. ๋JIE [internet]. 2022 Apr. 30 [cited 2026 Jan. 8];21(1):67-78. available from: https://ph01.tci-thaijo.org/index.php/JIE/article/view/247935