Current U.S. Class: 156/345; 414/331; For Emptying Contents Thereof Into Portable Receiving Means (414/404); 414/416; 414/7441; Including Wafer Orienting Means (414/936); Including Means For Charging Or Discharging Wafer Cassette (414/937); Wafers Positioned Vertically Within Cassette (414/938); Wafer Cassette Transporting (414/940); Includes Means For Gripping Wafer (414/941); 134/251; 134/254; Sequential Work Treating Receptacles Or Stations With Means To Transfer Work Or Fluid-applying Devices (134/61); Traversing Hoist-type Work Transfer Means (134/76); Interconnected Tank Closure And Other Movable Element (134/143); Semiconductor Wafer (134/902); Liquid Treatment (118/73); With Means For Moving Work Through, Into Or Out Of Pool (118/423)