Issue 107: P33 subproperty of P12
P33 used specific technique (was used by) should be subproperty of
P12 occurred in the presence of (was present at)
(Scope note: This property describes the active or passive presence of a persistent item in an event without implying any specific role.
It connects the history of a thing with the place and date of an event. For example, an object may be the desk, now in a museum on which a treaty was signed. The presence of an immaterial thing implies the presence of at least one of its carriers. Examples: Deckchair 42 (E19) was present at The sinking of the Titanic (E5))
Reason: the specific technique participates through its carrier, as any immaterial object can do.
P33 used specific technique (was used by) should be subproperty of P12 occurred in the presence of (was present at).