Yuhchang was established on April 28, 1967 with capital of NT$ 4 million (US$ 100,000), and began to manufacture chargeable lights, emergency lights safety lights for mine use, and concrete liquid battery.
In 1970 Capital increased up to NT$ 6 million (US$150,000), we imported foreign advanced technology to produce high & low voltage capacitors.
In 1973 Capital reached to NT$ 10 million, and the company was certified as a qualified factory by Taiwan Power Company.
In 1977 The company was rated grade A in terms of qualified exporter and quality control factory by Merchandise Office of Economic Association (MOEA). Taipei branch has been established since.
In 1978 High & low voltage capacitors were granted the No.2845 and 2846 CNS Mark by Central Standard Department. Kaoshiung branch has been established since.
In 1979 With increasing capital of NT$19 million (US$ 500,000), square type capacitors used for electrical apparatus were successfully developed.
In 1983 With capital of NT$ 30 million (US$ 750,000), MF low voltage capacitors were successfully developed.
In 1985 Capacitors for induction cookers and microwave were developed.
In 1987 With capital of NT$36 million (US$1,200,000) and increase of factory area 1,800 square meters, new model dry type capacitors, YE-P type, used for internal protection of electrical apparatus were approved by American UL standard.
In 1988 With capital of NT$50 million (US$1,750,000), emergency lights were granted the No.5053 CNS Mark by Central Standard Department.
In 1990 With capital of NT$60 million (US$2,220,000), 7.35KV and 14.7KV capacitors were certified by Taiwan Power Company.
In 1992 Capacitors for electrical apparatus were approved by American UL standard. Taoyung branch has been established since.
In 1994 With capital of NT$80 million (US$3 million), capacitors, S series, used for electrical apparatus were certified by Germany VDE standard. Quality approval of ISO 9002 standard were certified.
In 1994 Acquired ISO 9002 for capacitors.
In 1997 Acquired ISO 9002 for emergency lights.
In 2001 Acquired ISO 9001:2000 for capacitors.