| 摘要 |
The Butterfly Push-Pull Pin, also referred to as a force advantageous push-pull pin in this application is a practical fastener used to support penetrable materials on supporting material such as a bulletin board, notice board, tack board, wall or other element penetrable by a push pin. In the Butterfly Push-Pull Pin, two broad, sloped, opposing sides of a polygonal handle are grasped to push the pin in. Two other broad, sloped, opposing sides of the polygonal handle are used to pull the pin out. |
