Blackstone was based in Jamestown NY. Dates back to the 1800s, shut down in 1977-1980. Their early automatics had a 100% mechanical timer system running on gears and levers off the main drive motor, including operation of the fill valves. The inlet water wouldn't shut off if a power failure occured during fill, resulting in an overflow if the user didn't shut off the supply taps.
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The family business of board member "blackstone" sold ... Blackstone!