Hi,
You have to know whether those attributes are Display or Navigational? You can check in 0equipement infoobject definition in Attributes tab.
Go to Master data tab-->You will find any of the following tables
P Table - Time Independent Display Attributes
Q Table - Time dependent Display attr
X Table - Time independent Nav Attr
Y Table - Time dependent Nav Attr
You have to choose your right table and delete the unwanted records. If you are not able to delete directly from the table, then you can delete in SE14 for the table.
Regards,
Suman