Assertion: buggy | /r/HasProperty | designed on square tubes
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Source sentences:
text: He also designed the 'Gadabout folding chair' which was produced from 1961, and was commissioned by the Ministry of Health to design a larger folding buggy for larger children with disabilities called the 'Buggy Major' this buggy was designed on square tubes instead of the usual round tubes like the 'Baby Buggy', being produced around 1970.