Road to Front Runner Vol.5「Charmant」Becoming of a medical device manufacturer

Becoming of a medical device manufacturer:
Sabae City in Fukui Prefecture is the hub for domestic eyeglass production. Here we find Charmant, a world-class manufacturer of eyeglass frames for customers in about 100 countries.
How did this glasses frame manufacturer enter the medical device industry?

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Road to Front Runner Vol.5「Charmant」Becoming of a medical device manufacturer