Electronic Manufacturing Services Companies Companies that offer electronic manufacturing services (EMS) help original equipment manufacturers design, assemble, produce and test electronic components and printed circuit boards (PCBs). However, not all companies require each of these services. Some companies choose one or a combination of one or more services according to their requirements and the type of company they are. For example, some companies before the product development stage only require a customer design file, purchase the components from a trusted distributor and then assemble and ship it for testing purposes. Also, EMS companies offer on-site services, such as PCB engraving, or provide them through a contractor. inYantra, one of the best electronic products manufacturing companies in Mumbai, and one of the leading electronic products manufacturing companies in Gujarat shed some light on the various services offered by electronic products manufacturing service companies.