7 Machines to deposit by a high vacuum sputtering technique a thin layer of material sputtered from a target on a substrate, in the field of precision film deposition; precision thin film deposition machines to deposit a thin layer of material sputtered from a target on an optically transparent substrate, in the field of precision film deposition; machines to build multi-layer optical filters, in the field of precision film deposition; machines to build gain flattening, add/drop multiplexers, in the field of precision film deposition; machines to build multi-dielectric narrow band optical filters for dense wavelength division multiplexing applications, in the field of precision film deposition; vacuum pumps for use in apparatus for vacuum deposition of optical coatings on substrates, parts for all the aforementioned goods