An inspection method using an electron beam. Another object of the present invention is to fabricate a highly reliable light-emitting element using the composition at low cost and high productivity. The emergency telephone includes a memory device for storing functions and data and which is designed to be removed and reinstalled in the housing or to be replaced by a different memory device. A further parameter can also be used to divide the output frequency of the phase locked loop circuit to supply a specified output frequency. The first piece may include a disk-shaped body having first and second opposite sides. For several different A-V delays, the system measures time intervals between atrial depolarizations and accelerometer-detected MVCs.