A double diaphragm pump for moving large volumes of water that may be laden with debris includes a pair of fourteen-inch diameter elastomeric diaphragms, driven by reciprocating push rods pivotally coupled to opposed eccentrics. The case can include a case body and a case cover and an opening surface of the case body that is parallel with the longitudinal axis of cigarettes. At least one profile parameters of the photomask structure is determined using the optimized integrated optical metrology model. A housing houses a transmission mechanism of the transmission.