ProductionTwinInterval

"""
A span during which the work centre twin held one judgement of the machine
"""
type ProductionTwinInterval {
  """The machine's state as the twin judged it"""
  state: WorkCenterTwinState!
  """When the twin recorded this judgement"""
  start: ISO8601!
  """When a later judgement replaced it; null while it still holds"""
  end: ISO8601
}