| 摘要 |
A method of manufacturing a level tool is presented. The method includes providing a frame, providing a pair of plastic cover plates arranged on opposite sides of the frame, and forming at least one vial window in each cover plate by a dual plastic injection molding process, wherein the at least one vial window is made of a plastic material of a different color than the cover plate and is configured to receive and support at least a portion of a vial.
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