| 摘要 |
A three-wire apparatus for measuring an external thread features a single length of wire having a first bend and a second bend, which first and second bend divide the single length of wire into first, second and third wire portions. The first, second and third wire portions engage an external thread and are measured using a micrometer or other measuring device. The single length of wire defines an open end for engaging the first, second and third wire portions with the external thread.
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