January mornings in Patterson start with a cold that gets into everything — metal, hinges, the long hesitation before an engine catches. A & S Ignition Co knows that hour intimately, and it happens to be the same hour they head out to plow. Driveways, walkways and lots get opened, scraped and salted while most of the town is still under blankets. The valley traps cold air overnight, so snow that fell soft at nine can be locked hard by five, which makes an early start less a preference than the whole trick of it. They like the look of a black driveway with clean white walls standing on either side.