Abstract: The present invention relates to a composition for forming a composite polymer film, a method for preparing the composition for forming a composite polymer film, a composite polymer film and a method for preparing the composite polymer film. The composition for forming a composite polymer film comprises: a fluorine-based polymer solution comprising a fluorine-based polymer; and polyvinylidene fluoride nanoparticles dispersed in the fluorine-based polymer solution. The method for preparing the composition for forming a composite polymer film comprises the steps of: preparing a fluorine-based polymer solution comprising a fluorine-based polymer; and dispersing polyvinylidene fluoride nanoparticles in the fluorine-based polymer solution. The composite polymer film comprises: a polymer matrix formed from a fluorine-based polymer; and polyvinylidene fluoride nanoparticles dispersed in the polymer matrix.

Abstract: Vise grip pliers capable of stably clamping an object with a simpler structure than that of normal vise pliers and also providing a vise grip function by means of a simple operation. To this end, the present invention has first and second jaws formed at the front end of a body, forms a space in which a ring pin can be provided, by outwardly bending handles, and then rebending the same without extending the handles immediately after hinge parts cross each other, in addition to, one hinge crossing the jaws in an X-shape by a hinge pin (P), and ensures the vise grip function by providing a tapered ring in the ring pin space, and then recrossing the handles in an X shape.

Abstract: Vise grip pliers capable of stably clamping an object with a simpler structure than that of normal vise pliers and also providing a vise grip function by means of a simple operation. To this end, the present invention has first and second jaws formed at the front end of a body, forms a space in which a ring pin can be provided, by outwardly bending handles, and then rebending the same without extending the handles immediately after hinge parts cross each other, in addition to, one hinge crossing the jaws in an X-shape by a hinge pin (P), and ensures the vise grip function by providing a tapered ring in the ring pin space, and then recrossing the handles in an X shape.

Abstract: Disclosure relates to a bidirectional gun bore cleaning device for rapidly cleaning the bore of a gun barrel with less manpower by using a striking force (impact energy) of a striking hammer to easily move a cleaning brush in the bore. The bidirectional gun bore cleaning device is coupled to an end of the existing cleaning rod when being used.

Abstract: Disclosure relates to a bidirectional gun bore cleaning device for rapidly cleaning the bore of a gun barrel with less manpower by using a striking force (impact energy) of a striking hammer to easily move a cleaning brush in the bore. The bidirectional gun bore cleaning device is coupled to an end of the existing cleaning rod when being used.