Photon Control Announces the Mailing of its Management Information Circular in Connection with its Annual and Special Meeting to Approve Acquisition by MKS Instruments VANCOUVER, British Columbia, June 01, 2021 (GLOBE NEWSWIRE) -- Photon Control Inc. ( Photon Control or the Company ) (TSX: PHO), a leading developer and supplier of optical measurement technologies and systems, is pleased to announce it has mailed and filed a management information circular and related meeting materials (the Meeting Materials ) for its annual general meeting of shareholders and special meeting (the Meeting ) of Securityholders (as defined below) to be held June 29, 2021, in connection with, among other things, the proposed acquisition of the Company by MKS Instruments, Inc. ( MKS ) announced on May 10, 2021 (the Transaction ).