In which period was the timetable invented?
In which period did the schedule first established?
In which period did the schedule arise?
In which period did the calendar originally devised?
During what period did the calendar originally envisioned?
During what period was the schedule initially established?
During what period did the calendar creation?
When did the timetable arise for the first time?
In which period was the timetable invented?
In which period did the schedule first established?
In which period did the schedule arise?
In which period did the calendar originally devised?
During what period did the calendar originally envisioned?
During what period was the schedule initially established?
During what period did the calendar creation?
When did the timetable arise for the first time?
