# Relationship history for MSHA mine 3503462

Current hierarchy: **Alberts Cecil R (Mike) → American S & G → AMERICAN S & G**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** American S & G → AMERICAN S & G; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alberts Cecil R (Mike) → AMERICAN S & G; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alberts Cecil R (Mike) → American S & G; 1998-04-01 to current/open; source msha-controller-operator-history