Abstract: In a customer transaction system, when a customer terminal device transmits a withdrawal transaction request to a management device, the management device performs a withdrawal transaction request to a financial system server and deducts a withdrawal amount from an account balance. The management device sets, on an automatic teller machine, a withdrawal limit based on the withdrawal amount, generates a withdrawal code and notifies a customer terminal device of the withdrawal code. When the customer terminal device with the withdrawal code being displayed on a display unit is held over the automatic teller machine, the automatic teller machine reads the withdrawal code, makes a withdrawal execution request to the management device, and performs withdrawal based on the withdrawal limit upon receiving withdrawal approval from the management device.

Abstract: The fluoride glass of the present invention, which contains, as anions, a small amount of chlorine in addition to fluorine, has advantages such as (1) it is less liable to crystallize as compared with a fluoride glass containing no chlorine and yet shows substantially no deterioration in chemical durability and mechanical strength due to chlorine inclusion and (2) its refractive index can easily be changed by changing the addition amount of chlorine.

Abstract: A fluoride glass comprising AlF.sub.3, ZrF.sub.4 and/or HfF.sub.4, and at least one compound selected from CaF.sub.2, SrF.sub.2 and BaF.sub.2, and a fluoride glass comprising these components and at least one additional component selected from MgF.sub.2, YF.sub.3, NaF and other like compounds have the advantages that there hardly occurs crystallization in the production thereof, and that they are excellent in chemical durability, high in surface hardness, so that they can ideally serve as glass to be used for low loss optical fiber, infrared optical fiber for thermometer, infrared laser window, etc.