Imran, HI., Mahi,RB., Saha,R., Islam, H., Imran, I. Nishash: A Reasonable Cost-Effective Mechanical Ventilator for COVID Affected Patients in Bangladesh. VOLUME 8, ISSUE 5, E09400, MAY 01, 2022, Heliyon. DOI:https://doi.org/10.1016/j.heliyon.2022.e09400