Halma p.l.c. is engaged in making products, which detect hazards to protect the assets and people in the public and commercial buildings. The principal products manufactured by the Company are sensors for fire, security, automatic doors and elevator safety. The Company operates in three business segments: infrastructure sensors, health and analysis, and industrial safety. In September 2008, the Company completed the acquisition of Fiberguide Industries, Inc. In November 2008, the Company completed the acquisition of Oerlikon Optics USA, Inc. In January 2008, the Company completed the selling of Post Glover Lifelink, Inc. (PGL). The wholly owned subsidiaries of the Company include Fortress Interlocks Pty Limited, TL Jones Limited, E-Motive Display Pte Limited, Halma Holdings Inc., Air Products and Controls Inc., Aquionics Inc., B.E.A. Inc. and Bio-Chem Fluidics Inc.