M1 carbine maker stamps

[ob'98]

I have a few parts for a M1 Carbine that I am trying to ID the makers. What I haven't ID'd yet are:
1. Safety, push type: "EW"
2. Safety, push type: E-S'G'
3. Recoil plate: unmarked with a casting line?
4. Recoil plate: PJ on side of tang.
5. Trigger housing: ST
6. Bolt: A.I. and then perpendicular to that is a larger I or a 1
7. Bolt: O.I. and then perpendicular to that is a 2

Thanks for the help.

Information

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[JimF4M1s (Deceased)]

You have a few desirable parts.

1. "EW" safety made by Eaton Ponds Co. Springfield Mass for Winchester.
2. E-S'G' safety made by Eaton Ponds Co. Springfield, Mass. for Saginaw.
5. ST trigger housing made by Talon Inc. Meadville, Pa. for Standard Products.
6. A.I. & O.I. bolts made for Inland.
3. & 4. recoil plates. Replacement? Someone here will know who.
Jim

[raycer911]

You have a few desirable parts.

1. "EW" safety made by Eaton Ponds Co. Springfield Mass for Winchester.
2. E-S'G' safety made by Eaton Ponds Co. Springfield, Mass. for Saginaw.
5. ST trigger housing made by Talon Inc. Meadville, Pa. for Standard Products.
6. A.I. & O.I. bolts made for Inland.
3. & 4. recoil plates. Replacement? Someone here will know who.
Jim

I have often seen these, but always wondered what the sideways numbers 1, 2, or 3 indicated on the left lug of Inland bolts. Anyone have ideas? I seem to recall that British Enfield bolts had a separate threaded endpiece that was numbered to enable adjustment of headspace.

[Bruce McAskill]

PJ recoil plate is a war time replacement and the cast unmarked one is a post war replacement.

[Curt]

My IP bolts have numbers on the lugs too.

[jimb16]

The numbers are supposedly heat lots. they get higher as the serial #s increase. The numbers on the enfield bolt heads are headspace indicators and are completely different in meaning.