text: from bika.lims.controlpanel.bika_instruments import InstrumentsView
  from bika.lims import bikaMessageFactory as _
  from bika.lims.utils import t
  
  class InstrumentTypeInstrumentsView(InstrumentsView):
  
      def __init__(self, context, request):
          super(InstrumentTypeInstrumentsView, self).__init__(context, request)
          url = self.portal.absolute_url()
          url += "/bika_setup/bika_instruments/"
          self.context_actions = {_('Add'):
                                  {'url': url+'createObject?type_name=Instrument',
                                   'icon': '++resource++bika.lims.images/add.png'}}
  
      def folderitems(self):
          items = InstrumentsView.folderitems(self)
          filtered_items = []
          for item in items:
              if 'obj' not in item:
                  continue
              itype = item['obj'].getInstrumentType()
              if itype and itype.UID() == self.context.UID():
                  filtered_items.append(item)
          return filtered_items
  