THE NOCK REFRACTORIES CO. 1243 East 55th Street Cleveland, OH 44103 (216)431-2500 Fax: (216)431-5330 1-800-ITS-NOCK (487-6625) Contact Us Serving industry since 1912, The Nock Refractories Co. is a third generation, family owned and operated business, providing more than 100 years of collective expe...