A tube seal is fitted with a spherical spring, being an elastic member, at one end of a tubular barrel. The therapy system may be operable in accordance with the portion of the set of operating parameters stored in the memory device. The input stage is configured to receive the input signal and provide a level-shifted signal that has an average signal level that is shifted in regards a level shift value. The computer system automatically calculates a season determination value for each of the digital images and automatically selects images for use in a seasonal image product. The dry etcher includes an etching device into which etching gas is injected to etch a layer formed on a substrate, a substrate transfer device transferring the substrate processed by the etching device, and a cleaning device cleaning the substrate transferred by the substrate transfer device.