Applies to glass merchants who conduct their operations at a permanent shop location. Includes the receiving, storing and selling of glass such as window glass, plate glass, safety glass for automobiles, mirrors and other types of glass. Includes bending, grinding, beveling or silvering of plate glass. Contemplates installation of glass into frames provided such work is performed in the shop. Refer to code 5462 for employees engaged in the delivery and installation of replacement windows away from the shop. Codes 4130 and 4131 shall not be assigned to the same risk unless the operations described by these classifications are conducted as a separate and distinct business.