Why is pinpointing the exact origin date or inventor of the metal chain difficult?
Answer
It was a gradual technological ascent.
The development of the metal chain is characterized as a gradual technological ascent, moving incrementally from crude iron loops to modern high-strength components rather than stemming from a single inventor or date.

Related Questions
What material were the simple bindings that predated metal chains made from?Why is pinpointing the exact origin date or inventor of the metal chain difficult?What was a fundamental, early purpose for which metal chains were used?Which material did blacksmiths begin fashioning chains from, offering superior strength compared to earlier alloys?What was a primary characteristic of early metal chains fashioned by hand?By what time period did iron chain cables begin reliably replacing traditional rope moorings in maritime settings?What did the focus shift towards once iron and steel became readily available manufacturing materials for chains?What specific weakness were early wrought iron chains susceptible to, often related to how they were joined?What monumental step characterized the development of the roller chain in power transmission?How does a chain designed for motion (drive chain) differ fundamentally from one designed primarily for holding (anchor chain)?The evolution toward roller chain technology shifted the perceived 'inventor' role away from the blacksmith and toward whom?