. The Bell System technical journal . q:< 1- A GROUP NO. 5 A\^^ 12 TRUNKS, a= 10 11 f(r) O //v. c y^ ^x^\_^ a 0 20 r GROUP NO. 7 /\ 10 TRUNKS, a = 748 /7X\ f(r) / nk yy \v 0 ---^r ^^^^^C::^—-^ GROUP 14 TRUNKS,;. GROUP TRUNKS, i 8 10 12 14 16 18

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1