At what time did the schedule originated?
When was the schedule initially introduced?
In which period did the schedule arise?
In what period was the schedule firstly devised?
In which period did the agenda initially conceived?
In which period was the timetable firstly devised?
During what period did the calendar creation?
In which period did the timetable arise for the first time?
At what time did the schedule originated?
When was the schedule initially introduced?
In which period did the schedule arise?
In what period was the schedule firstly devised?
In which period did the agenda initially conceived?
In which period was the timetable firstly devised?
During what period did the calendar creation?
In which period did the timetable arise for the first time?
