| 摘要 |
A ball point pen includes a tubular member with a hollow interior placeable in fluid communication with an ink supply, a socket formed at one end of the member having a seat and a cylindrical wall extending from the seat and a rim structure disposed at the end of the cylindrical wall opposite the seat, a spherical ball disposed in the socket, rotatably engagable with the seat and captured by the rim structure, the diameter of the ball being at least three percent smaller than the diameter of the seat at the intersection of the seat and the cylindrical wall.
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