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  2. Vacuum cleaner - Wikipedia

    en.wikipedia.org/wiki/Vacuum_cleaner

    Introduced in 1954, The Hoover Company's Constellation was of the cylinder type and lacked wheels. Instead the vacuum cleaner floated on its exhaust, operating as a hovercraft , although that was not true of the earliest models, which had a rotating hose, the intention being that the user would place the unit in the center of the room, and work ...

  3. List of wind tunnels - Wikipedia

    en.wikipedia.org/wiki/List_of_wind_tunnels

    Mach 0.4 – 2.0; return max speed 12 m/s. Part of the UK National Wind Tunnel Facility: Cranfield University 8x4 Atmospheric Boundary Layer Wind Tunnel [17] Operational 2.4 m (7 ft 10 in) by 1.2 m (3 ft 11 in) United Kingdom Cranfield University 8'x6' Low Speen Wind Tunnel [17] [23] Operational 2.4 m (7 ft 10 in) by 1.8 m (5 ft 11 in)