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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
Some have extender chains so the clasp can be hooked at different lengths. Some have a sliding adjuster that can be pulled to tighten or loosen depending on the direction, like bow ties. Others are elastic, which cannot be changed but can be stretched.
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