You may never have heard of L-com, but its products enhance countless common devices, such as telephones, computers and flourescent lighting units. Known as a value added manufacturer, the company combines basic components (wires, cables, etc) in order to create niche custom products. This business-to-business retailer typically works with large corporations such as Lockheed Martin and Boeing. Despite its international reach, founder and local man Al Contarino wanted to be sure to keep jobs in the area, which is why he keeps a manufacturing plant and offices in North Andover.