Biosensors for inspection of environmental pollution; [ biosensors for food inspection; wireless modules, namely, transceivers for short-range wireless and for radio monitor; frequency synthesizers; ] SAW (surface acoustic waved) devices, namely, resonators, filters, diplexers for mobile phones, for short-range wireless and for fixed communication and broadcasting; [ angular rate sensors for the detection of acceleration accompanying rotation motion and changes in motion speed, for use in digital still cameras, digital video cameras, electronic stability control systems installed in cars, car navigation systems, and car rollover prevention systems; gyro sensors for the detection of angular velocity, for use in camera shake correction mechanisms, car navigation systems, computer game machines, radio-controlled helicopters and robots; pneumatic sensors for the detection of air pressure and temperature of tires, for use in tire pressure monitoring systems; crystal wavelength plates and crystal birefringent plates, namely, optical devices that alter the polarization state of a light wave traveling through it; ] optical components, namely, optical filters and optical plates; crystal units for oscillation of frequency range in mobile phones, TV tuners, USBs (universal serial bus), W-LANs (wireless local area network), cameras, GPS systems (global positioning system), TVs, video equipment, PCs, game consoles, portable media players, car electronics, and fixed radio communication devices, all using RF (radio frequency), PLL (phase-locked loop), or RFID (radio-frequency identification) technology; crystal oscillators; clock oscillators [ ; crystal filters that are used to pass through and cut off frequency range within a frequency band, for use in communication devices; SAW (surface acoustic wave) filters, namely, electromechanical devices used in radio frequency applications; duplexers, namely, a communication system composed of two connected devices which can communicate with one another in both directions, for use in communications networks; diplexers, namely, a device that separates radio waves according to set frequency wave bands which correspond to different portable telephone formats, allowing one terminal phone to use portable telephone services with different formats ]