Motorola MC1312P, MC1314P and MC1315P
SQ-decoder ICs data sheets
If you wonder about MC1313P, it was an automotive version of MC1312P.
I have found some info about equivalents to these:
MC1312P = ECG799 = NTE799 = 15-34906-1
MC1314P = ECG802
MC1315P = ECG803