During what period did the schedule invented?
In which period did the schedule initially developed?
In what period did the schedule come into existence?
At what time did the timetable originally devised?
During what period did the timetable firstly envisioned?
At what time was the timetable firstly established?
At what time did the schedule creation?
In which period was the timetable arise for the first time?
Who invented the first calendar WiseAnswers
