Abstract: The decorative objects on which a light-interference surface layer showing an esthetic design is formed is produced by the steps of forming a metal thin film on glazed and baked surface of a base body and treating the base body at high temperature in oxygen atmosphere, and which are highly useful as decorative articles, dinner sets, building materials, and industrial art objects.

Abstract: This invention provides a process for preparing artificial leather bands or belts, particularly those suitable for use as watch bands or straps which are characterized by bearing close resemblance to natural leather in the appearance, feeling and touch and toughness of the product, inexpensive production cost and easiness in the production control.

Abstract: There are provided improvements in the formation of a bearing hole in the body of a strap member made of a thermoplastic resin and particularly adapted for use as a watch strap, said bearing hole being intended to receive therethrough a spring rod or the like for mounting said strap member onto a watch case or the like.Firstly, the improvements are directed to a method of forming a bearing hole in one end of the body of said strap member which comprises having said end of said body contacted by a tubular member having a central axis thereof penetrated by a core member of a material having a small dielectric loss and being of a nature not to be fused with said strap member body even when heated, and then integrally heat uniting together said strap member and tubular member by means of a high frequency adhesion device in a silicone rubber press mold to form a bearing hole at a right position in the body of said strap member.