Assertion: elevator's design | /r/HasProperty | executed by engineer
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Source sentences:
text: A merchant named Joseph Dart, Jr., is generally credited as being the one who adapted Oliver Evans' grain elevator (originally a manufacturing device) for use in a commercial framework (the transshipment of grain in bulk from lakers to canal boats), but the actual design and construction of the world's first steam-powered "grain storage and transfer warehouse" was executed by an engineer named Robert Dunbar.