obtain the time also via the three public NTP time servers operated by PTB. In Berlin-Adlershof, PTB operates the MLS (Metrology Light Source) electron storage ring for calibrations in the field from the infrared (THz) to the extreme ultraviolet (EUV). Department Q.5 "Technical Cooperation" realizes projects of the German and international development cooperation in the field of quality infrastructure. These activities promote competitiveness as well as environmental protection and consumer protection in developing countries and in countries in transition. One of the tasks of PTB’s "Metrological Information Technology" Department – in accordance with the German Gambling Ordinance (§ 11 ff. SpielV) – is to grant type approvals for gaming machines which offer the possibility to make winnings. Also, according to the Federal Ordinance on Voting Machines, PTB is in charge of the type approval of voting computers. This is, however, moot as, in a judgment of 3 March 2009, the Federal Constitutional Court has declared the use of such voting machines to be inadmissible. Weapons which may be carried with the Minor Firearms Certificate, i.e. weapons for shooting blanks or irritants and weapons used as signaling devices, require a PTB test mark for their approval. Occasionally, these weapons are also jointly referred to as "PTB weapons" and bear the PTA or PTB proof mark F (see also: Act on the Proof Testing of Arms and Ammunition). Sites and structure The main site of PTB is in Braunschweig (Lehndorf-Watenbüttel). Other sites are in Berlin-Charlottenburg and Berlin-Adlershof. Divisions 1 to 6 as well as Division Q are located in Braunschweig. In Berlin-Charlottenburg Divisions 7 and 8 are located, and in Berlin-Adlershof the two electron storage rings BESSY II and the Metrology Light Source (MLS); the latter is located in the Willy Wien Laboratory. PTB is headed by the Presidential Board in Braunschweig, which is composed of the President, the Vice-President and a further member. Another executive committee is the Directors' Conference, with the Presidential Board and the Heads of the Divisions as members. PTB is advised by the (PTB's Advisory Board), which is composed of representatives from science, the economy and politics. PTB is composed of the following nine divisions: Division 1: Mechanics and Acoustics (site: Braunschweig) with the following departments: Mass, Solid Mechanics, Velocity, Gas Flow, Liquid Flow, Sound, Acoustics and Dynamics Division 2: Electricity (site: Braunschweig) with the following departments: Direct Current and Low Frequency, High Frequency and Electromagnetic Fields,