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" We are seeing a repeat of the trend in manufacturing where companies that designed and built their own boxes , realized that they could get them designed and built by contract manufacturers , and focus instead on marketing and branding , " Subramanian added . They can be principal designers or involved in implementation , typically at companies that design , implement and sell these products . In short , ABMA represents the companies that design and build the systems that combust the fuels that generate the steam and hot water that powers and comforts America and the world .