I think there may have been more than that as for a 3G switch using the Δ format (which the original switch appears to be but is not clear) there must be:
a minimum of 3 terminals in use on the top row and
a minimum of 3 terminals in use on the bottom row
In the notes and the pictures this is not the case.
a minimum of 3 terminals in use on the top row and
a minimum of 3 terminals in use on the bottom row
In the notes and the pictures this is not the case.
