To secure the benefits of a low phase noise, wide tune range SAW oscillator in noisy environments, the tunable two port SAW resonator circuit within the oscillator is employed in differential mode, connected to a differential amplifier circuit to create a differential oscillator. In the treatment space, a chemical liquid is supplied by a chemical liquid nozzle onto the substrate, and an atmosphere replacement gas is supplied by a replacement nozzle into the treatment space. Each of the plurality of organic light emitting units includes a first electrode formed on the base rod, an organic layer formed on the first electrode, and a second electrode formed on the organic layer. Such lower molecular weight polymers also have the combination of a higher melt flow index and lower apparent viscosity, which is useful in a wide variety of fiber forming applications, such as in the meltblowing of nonwoven webs.