This property identifies E57 Material employed in an E11 Modification.
The E57 Material used during the E11 Modification does not necessarily become incorporated into the E24 Physical Man-Made Thing that forms the subject of the E11 Modification.
Examples:
the repairing of the Queen Mary (E11) employed Steel (E57)
distilled water (E57) was employed in the restoration of the Sistine Chapel (E11)
