     Whirlwind

8  1869          ,   Whirlwind (    ).      ,     .     .     ,     -         .     American Carpet Cleaning Company       25    (    ,  ,     1     23  ).         .   , ,     .   Whirlwind    ,         ver.            .   20   Hoover      .   λ  $ 60      .     1920-30-     ,        .      Electrician  1926 :    ,    .           .        ,             .             .       .          -,    ,         ... 