Pentax 2012 Annual Report Download - page 4

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1940s
1941 Nov An optical glass production plant was established in the city of HOYA in metropolitan Tokyo,
and production of optical glass began.
1944 Aug The plant incorporated with capital of 1.2 million yen.
1945 Oct HOYA discontinued production of optical glass at the end of Second World War and
launched crystal products.
1950s
1952 Feb The manufacture of optical glass BK7 (borosilicate glass) resumed.
1960s
1960 Nov Showa Plant (Akishima city, Tokyo, the present Akishima Plant) was
established.
1961 Oct HOYA listed on the Second Section of the Tokyo Stock Exchange.
1962 May The manufacture of eyeglass lenses began.
1967 Apr The company launched progressive multifocal lenses.
1970s
1972 Dec The production of soft contact lenses began.
1973 Feb HOYA listed on the First Section of the Tokyo Stock Exchange.
History