There are two main types of hormonal contraceptive formulations: combined methods which contain both an estrogen and a progestin, and progestogen-only methods which contain only progesterone or one of its synthetic analogues (progestins).
A public limited company (legally abbreviated to plc) is a type of public company (publicly held company) under United Kingdom company law, some Commonwealth jurisdictions, and the Republic of Ireland.t is a limited (liability) company whose shares may be freely sold and traded to the public (although a plc may also be privately held, often by another plc), with a minimum share capital of Â£50,000 and the letters PLC after its name.
Where ever there is a need to control devices the PLC provides a flexible way to softwire the components together. The basic units have a CPU (a computer processor) that is dedicated to run one program that monitors a series of different inputs and logically manipulates the outputs for the desired control.