the conveyance of letters, parcels, etc., along tubes by compression or exhaustion of air.
单词 | θ197760 |
释义 | society > communication > correspondence > postal services > [noun] > types of service > conveyance of mail by pneumatic tube (2) pneumatic dispatch1860 the conveyance of letters, parcels, etc., along tubes by compression or exhaustion of air. blow-post1881 a system of conveying letters and parcels by pneumatic tubes. |
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