Hazeltine was a very old radio company, going back to
the 1920s, although based around design/patents/licensing rather than manufacturing,
originally at least.
Terminals were an offshoot or sideline.
Very little of which were likely made by them anyway. But what do I know. F'rinstance
the Sperry ?/Leading Edge Model M was wholly a Mitsubishi product. Even the monitors were
M*, and at least 1 model externally bore a striking resemblance to the TRS-80 CM-1 used
w/the model.2000. Like anyone cares.