These were popular among students at Yale University and other Ivy League colleges during the 1950s.
ສິ່ງເຫຼົ່ານີ້ໄດ້ຮັບຄວາມນິຍົມຈາກນັກຮຽນທີ່ມະຫາວິທະຍາໄລ Yale ແລະມະຫາວິທະຍາໄລ Ivy League ອື່ນໆໃນຊ່ວງປີ 1950.