hi fernando,
i am not sure what it is you have attached. are these line drawings taken from something else and to what date?
the crossbow i am looking for is of german design, except the style of the ivory fittings, which is islamic in form. the definate presence and use during this period is a good start for me.
thank you for your efforts and please expand more as to where the information came from. modern (post 1500

) depictions are useful, if included with reference that i can backtrack.
thanks again.