TIB 16, anyone familiar with this old IC?

[Pojo]

So I snagged an old Motorola car stereo from a buddy of mine who was gonna scrap it. It's a Motorola FM108M which appears to be from the late 60's maybe early 70's. Much of the guts are wired point to point with all carbon comp resistors and such. But I'm interested in the 4 small ICs labeled TIB 16 followed by what appears to be a date code. All have the Fairchild 'F' logo and 6 pins. 3 of them are black plastic 'dot' style packaging (date code on all 3 is '6839' and 1 of them is metal can (TO-18 I think, date code 7130...maybe this was a replacement part). I haven't been able to find anything out online about them. Searching the model of the radio shows a few links where I can purchase the manual, which I may do since it should have the schematic. But I also found a pic of an old newspaper article that lists this as one of the first car radios to use IC technology.

Anyway, I was wondering if anyone had a clue as to what these are?

[Digital Larry]

Wild guess, dual transistors.