The invention includes a device that saves space by functioning as a stepladder, walker, wheelchair, and Pilates chair. It can be used by elderly caregivers at foster care homes. The stepladder allows the retrieval of medical files or medications…

Hazardous gas detection is a tool specially developed to detect liquid petroleum gas and natural gas at the minimum concentration of gas in the air is 200 ppm and the maximum concentration of gas in the air is 10 000 ppm. Design and build a…