Most places in the world with the exception of the USA call a vacuum cleaner "a Hoover". The actual Hoover Company in the USA did not (to my knowledge) made an early non-electric vacuum. They were called "The Electric Suction Sweeper Company" until after World War 1. I've been to the Hoover Center a number of times, and would have remembered seeing an early Hoover without a motor, that looked like a Hugro (which the machine in the picture does).
I could be wrong. But I believe I would have noticed that at the Historical Center.