An impact printing device for printing postal bar code patterns on an information carrier. The patterns are a combination of parallel tall and short bars separated by spaces. The type elements are attached to a movable type carrier, each element comprised of pairs of vertical bars having different stroke...http://www.google.com.au/patents/US5415479?utm_source=gb-gplus-sharePatent US5415479 - Postal bar code printing with engraved character impact printer
