The HGY15 Mobile Type Concrete Placing Boom in Guinea-Bissau refers to a specific type of equipment used for efficiently placing concrete in construction projects. The HGY15 model is designed to be mobile, allowing it to be easily transported and set up at various job sites. Guinea-Bissau, a country located in West Africa, is the specific location where this equipment is being utilized for construction purposes. This concrete placing boom is likely to be contributing to infrastructure development and construction projects in Guinea-Bissau.