In 1818, baron karl von drais de sauerbrun, a German inventor patented a design called "running machine" or in German "laufmaschine". The object is then called "velocipede". In the UK known as "draisine", while in france called "draisienne".
 
Called as a running machine because "velocipede" actually only helps humans run faster. The rider sits on a wooden "velocipede" and has two moving wheels with two legs stuck to the ground. Kayuh connected to the chain and move the wheel like on a modern bike has not been known. However, at that time, "velocipede" became a popular way of personal transportation.
Another breakthrough by baron karl von drais de sauerbrun is a design that allows the front wheel to be driven. This is the development of the comte mede de sivrac model, the Frenchman who designed the two-wheeled vehicles. The sivrac design is known as velocifere.
Bicycles have been around for so long that they are one of those things that you never think about where they come from... kind of like chairs ha ha
Congratulations it's beautiful @parkyingnam . Must feel great - that is a lot of work!