Injection moulding method in which plastic material contained under pressure in an antechamber is injected into a mould cavity and fills said mould cavity under pressure, by expansion of the plastic material. The procedures may involve using one or more treatment beams to cause photocoagulation or laser coagulation to finely cauterize ocular blood vessels andor prevent blood vessel growth to induce one or more therapeutic benefits. Accordingly, a high speed switching of address signals can be achieved. A system for storing account and rule set certification information including a processor providing account information and a rule set to each of a plurality of individuals and a database storing one or more data files, including one or more of a rule set file, an accounts owned data file and a transactions data file. An acoustic foam assembly is incorporated into the muffler housing.