| 摘要 |
PURPOSE:To increase strength by circularly forming the end section of a flat section in a quartz fork. CONSTITUTION:The end sections 10 of a flat section 6 in a quartz fork 4 are shaped circularly and are not tapered, and silicon bars 11 are buried along the end sections. Accordingly, the end sections are not damaged by impacts, and are not deformed by heat and weight, thus increasing strength, then durability for a prolonged term can be obtained.
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