78052 ⎘
Conveying articles through pipes or tubes by fluid flow or pressure; Conveying articles over a flat surface, e.g. the base of a trough, by jets located in the surface; Conveying the articles in carriers having a cross-section approximating that of the pipe or tube; Tube mail systems; Other devices for indicating or controlling movements of carriers, e.g. for supervising individual tube sections, for counting carriers, for reporting jams or other operating difficulties Automatically distributing the carriers to desired stations
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