Yes they were basically a metal-based Eureka upright, they were the invention of Don Clark and were mostly meant for commercial use, or so I've been told. There were not tons and tons made. Don got into trouble for this and almost lost his job but Airway decided they did need a power nozzle thus the metal RugMaster was born. The first known Don Clake nozzle was about 1968 made with a Hamilton Beach upright then later about 1971ish was Eureka.