An improved no-spill cup construction and valve assembly which provides an extremely secure seal against accidental liquid flow from the cup spout. A slope direction is defined by the edges of the slope and the gradient of the ground. The shell encloses a rod having a nickel layer with a phosphorous content, wherein the phosphorous content comprises a level of phosphorous sufficient, when the seed is implanted in tissue, to provide a defined magnetic resonance signature of the seed while substantially eliminating gross artifacts in the magnetic resonance image. The control method includes performing error correction on each of read data, and selecting one operation parameter out of the plurality of different operation parameters based on a result of the error correction. Rotation of the input drive shaft through a first range drives the trip linkage for opening the vacuum interrupter and moves the drive link though an over-center position without opening the isolating disconnect.