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· Electrical Contractor
3,370 Posts
Typical 70's installation.

It would appear that your panel is fed with type SE-U cable, which has a concentric neutral, but no separate ground. The neutral bar would typically be bonded to the enclosure through a bonding screw, or strap.

But 35-40 years ago, many jurisdictions did not properly enforce the Code for proper bonding and grounding.
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