Assertion: endotracheal tube's diameter | /r/HasProperty | 255 mm
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Source sentences:
text: 2.9 mm, 8 F, 145 mm length (Sunmed Largo, Florida, US) and a tracheal intubation stylet, with a 2.0 mm outer diameter x 255 mm (Smiths Medical International Ltd, Kent, UK), were kept ready.