General ticket representation was prohibited by the 1842 Apportionment Bill and subsequent legislation, most recently in 1967 (Pub.
This was allowed because Pennsylvania had received an increase in the number of its representatives yet its legislature didn't pass an apportionment bill during those years.
Representatives were elected statewide at-large on a general ticket.
Occasionally, at-large representatives were also elected.
No at-large representatives were apportioned after the 78th Congress.