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Home › Asphalt shingles - color blend drop sequence randomized by deposition means controlled by random signal generator to obviate stripes on roof

Asphalt shingles - color blend drop sequence randomized by deposition means controlled by random signal generator to obviate stripes on roof

US Patent 4523543 · Granted Jun 18, 1985

Estimated economic value: $2,731,000 ⓘ

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