Tsai holds up a yellowing sales license issued by Mingtung Pharmaceutical Company in 1967, a testament to his 40-plus years in the medicine pouch business.
拿出 1967 年新明通藥行核發給他的「推銷員證」，泛黃的證書，見證蔡進興四十多年的「寄藥包」生涯。