Tender For corrigendum : supply of fabrication of optical bells for cnc centering & edging machine with od 4.5 mm , fabrication of optical bells for cnc centering & edging machine with od 6.0 mm , fabrication of optical bells for cnc centering & edging machine with od 8.0 mm , fabrication of optical bells for cnc centering & edging machine with od 10.0 mm , fabrication of optical bells for cnc centering & edging machine with od 12.0 mm , fabrication of optical bells for cnc centering & edging machine with od 14.0 mm , fabrication of optical bells for cnc centering & edging machine with od 16.0 mm