Hi folks. I am completely new to this. But I found this old bike today. The badge has what looks like Mt Fuji and says "OK MING LUN". The text in the side says "OK BRAND CONTRACTIBLE BIKE". I noticed "SHIMANO" on the shift lever. It is a complicated little thing and meaures 39" long and 29" to the top of the handlebar. Can anyone tell me what this odd little thing is? I cannot find a thing about it on the internet. Thanks for any help!