In his article, “Priority Assignment In Waiting Line Problems,” (Cobham, J.
Opns. Res. Soc. Am. 2, 70 (1954).) Alan Cobham obtained very interesting and
valuable waiting-time formulas both for single- and multiple-channel systems.
His reasoning is similar in the two cases, but it is given in detail for the
single-channel case, and for definiteness the ensuing remarks will be directed
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