# Relationship history for MSHA mine 4608677

Current hierarchy: **Michael  Southern → Grace Enterprises Inc → Sweeps Run #2**

- 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

- **controller_controls_mine:** Michael  Southern → Sweeps Run #2; 1984-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Grace Enterprises Inc → Sweeps Run #2; 1997-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Southern → Grace Enterprises Inc; 1997-11-01 to current/open; source msha-controller-operator-history