(A) poppet valve
(B) mechanical valve of the corliss, sleeve, rotary or semirotary type
(C) disc or feather type
(D) any of the above
(E) none of the above
(A) poppet valve
(B) mechanical valve of the corliss, sleeve, rotary or semirotary type
(C) disc or feather type
(D) any of the above
(E) none of the above
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