A chalk line device includes a housing and a chalk line stored in the housing. The chalk line terminates in a hook at one end and the hook is disposed outside of the housing. The housing may include a side wall with a depression formed therein that is shaped to receive the hook for storage. The depression...http://www.google.es/patents/US6915587?utm_source=gb-gplus-sharePatente US6915587 - Chalk line with viewing window
