An additional 25,000 square feet of production space was added to the manufacturing facilities of J. Wiss & Sons Co. in Newark as 1967 came to a close. The new building, dedicated Dec. 20, adds to the grinding and heat treating facilities of the 110-year-old manufacturer of shears, scissors, pinking shears and metal snips.

The new building is the third to be completed in a major expansion program, started in 1966. A new office building will be started early next year. All the new buildings are in the vicinity of the firm's main plant at 33 Littleton Ave.

Wiss also has a plant in Maplewood, chiefly for the production of garden shears and tinners' snips. The company employs over 900 people.