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TOHO POLYMER
JP3 patents
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US4657419AApr 14, 1987
Information carrier, having a roughened surface, method of manufacturing same, and apparatus therefor
TOHO POLYMER22 citations73
US4500218AFeb 19, 1985
Keyboard key with embedded top character
TOHO POLYMER19 citations72
US4463232AJul 31, 1984
Membrane switch having spacer posts
TOHO POLYMER12 citations65