 Budding went into partnership with a local engineer and manufactured his device, selling around 1,000 of his machines in the 1830s. The design would develop over time. Initially, a handle was added to allow the motion of the machine to be assisted by someone pulling from the front. It took nearly a decade before there was a patent for a horse or pony pulled version. And versions that used chains rather than gears, making the device lighter, came out in the 1850s. By the end of the 19th century, there were the first steam and petrol driven versions.