Yeah, this was drawn before the full flower of the age of celphones. For you millennials, "the extension" refers to a secondary handset of a landline telephone. If you picked it up when someone was on the main line, you could hear what they were saying.
Justin Cardinal Schubert
2016-12-21 21:48:22 +0000 UTCKarl Maurer
2016-12-21 18:54:41 +0000 UTC