Inverted plumb line hole protection device

• Main Authors: GUO YOU'AN, LI HONGBO, YU YI, ZHAI LI, ZHA HAIHUA, WU GUANGYAO, WANG HAIYAN, ZHAO JIAYAO
• Format: Patent
• Language: Chinese; English
• Published: 21.04.2023
• Subjects: GYROSCOPIC INSTRUMENTS; MEASURING; MEASURING ANGLES; MEASURING AREAS; MEASURING DISTANCES, LEVELS OR BEARINGS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS; MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; SURVEYING; TESTING

The utility model relates to an inverted plumb line hole protection device which comprises a combined support and a protection cover arranged above the combined support, a rectangular hole is formed in the center of the protection cover, a communicated strip-shaped groove is formed from one edge of...