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Agustina Hotma Uli Tumanggor, Cynthia Eka Fayuning Tjomiadi and Madschen Sia Mei Ol Siska Selvija Tambun 2022. Energy Consumption of Workers in the Palm Fruit Calcium Inspection Process by Wearing Masks to Go Up and Down Stairs during the Pandemic. International Journal of Engineering Technology and Natural Sciences. 4, 2 (Dec. 2022), 165 - 174. DOI:https://doi.org/10.46923/ijets.v4i2.188.