twin entry

twin entry

[′twin ′en·trē]
(mining engineering)
A pair of parallel entries, one of which is an intake air course and the other the return air course; rooms can be worked from both entries.
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References in periodicals archive ?
Also the twin entry points allowed me to nip outside when nature called.
9/10 A TWIN entry, because the Mersey duowere both in the relay teamwhich struck gold in Stockholm in 1912.
With two-stage turbocharging, the lowest fuel consumptions can be obtained with variants B1, B2 and D Charge-air intercooling seems to be necessary in terms of efficiency (variant B1 compared with B3), but it might be less important by use of a twin entry turbine (B2 compared with B1).
'This twin entry into the world's largest life assurance and retirement savings market further broadens Old Mutual's international business, which will now provide over 27 per cent of its global income,' said chief executive Jim Sutcliffe.