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Subject Solar energy Remove constraint Subject: Solar energy Date 1977 to 1979 Remove constraint Date: <span class='from'>1977</span> to <span class='to'>1979</span>

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    • circa 1978

    From 1968 to 1978, TEAL (Tokyo Electron Applications Laboratory) manufactured calculators under its own name and for other brands. The Photon was introduced in 1978.