Under the Road Transport Vehicle Law, each part of a car must conform to the safety standards stipulated by the law, and products that meet these standards are called "safety standard conforming products" (保安基準適合).
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Overview
wikipedia: 道路運送車両法 Road Transport Vehicle Law
When a new car is built, the entire vehicle must conform. The standard is listed on the Chassis ID plate.
B120 Datsun 1200 Truck 保安基準適合 8-4