Anyone know what hours 1st & 2nd shift ran "back-in-the-day"?

I went thru a few b'cast sheets. (if it's a 4 digit time stamp)

Plant
box 13/box 14 SPD

A
1/697 329
0/794 426
2/026 426
1/690 501
0/629 605 * 06:29 = 6:17 AM earliest

B
none 211
2/350 214 * 23:50 = 11:30 PM latest (hard to read "M" code GTS) & 214 was a Friday
1/350 312
1/379 411
0/922 427
1/508 506
2/182 523 * 21:82 = 9:50 PM
1/10? 606
0/950 609
0/802 610
1/301 612

F
1/857 505