Proton is a UK holding company but its subsidiary Proton Motor is based near Munich and has been developing and selling fuel cell products for more than a decade. The new 'Triple-hybrid' product is a combination of a fuel cell (made up of two stacks) running on hydrogen, battery and supercapacitors. It replaces the large pack of batteries that is in a standard fork lift truck. Proton's system is the same size and can be slotted into the fork lift truck and connected up easily. The ‘Triple-hybrid' name has been trademarked by Proton. Proton has also developed fuel cell systems for buses (which use six stacks), passenger ferries and street cleaning vehicles. Proton raised £4.67m at 80p a share when it joined Aim on 31 October 2006.