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Perspective Ruler invention patent
Perspective Ruler invention p
 plaster trowel patent certificate
plaster trowel patent certif
 formwork for openings reserved for pipes at slab
formwork for openings reserv
safety helmet with communication function patent certificate
safety helmet with communicat
concrete-mixer feeding device patent certificate
concrete-mixer feeding device
Pipeline fixing clamp patent certificate
Pipeline fixing clamp patent
hung type safety belt
hung type safety belt
single-plate air compressor
single-plate air compressor
Window installation and adjustment device patent certificate
Window installation and adjus
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