: Used for the inspection of holes and shafts that satisfy the "conditions of envelope" (maximum material requirement). 2. Core Concepts and Definitions

: Verify the least material limit (e.g., ensuring a hole is not too large or a shaft is not too small). Common Variants

Kenji didn’t look up. He was tracing a line on a prototype rule for a national telescope array. “Twelve microns is the width of a spider’s thread,” he murmured. “They relax it, and the stars shift.”

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