# Relationship history for MSHA mine 4606823

Current hierarchy: **John M  Stilley → Amerikohl Mining Inc → Prudy'S Run Site**

- 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:** John M  Stilley → Prudy'S Run Site; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Grace Enterprises Inc → Prudy'S Run Site; 1984-07-01 to 1988-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Southern → Prudy'S Run Site; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Southern → Grace Enterprises Inc; 1984-07-01 to 1988-10-25; source msha-controller-operator-history
- **operator_operates_mine:** Amerikohl Mining Inc → Prudy'S Run Site; 1988-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Stilley → Amerikohl Mining Inc; 1988-10-26 to current/open; source msha-controller-operator-history