Throughout the early period of game mass production, from the middle 19th century until the middle of the 20th, many games sought to teach children as their first purpose, and perhaps be fun to play as their second. Although relatively early on some other games were devised which were not didactic, many still held on to this. Perhaps the reason was the fact that parents were actually the ones purchasing the games; perhaps it was to market games in a world where 'gaming' was thought to be idle time. Either way, McLoughlin Brothers and later Milton Bradley, who bought the former manufacturer around 1920, produced a line of teaching card games under the title "Grandmama's Games." McLoughlin made a geography version in the late 19th century, and Milton Bradley continued with the same game in the early 20th.