# Relationship history for MSHA mine 4607194

Current hierarchy: **John M  Stilley → Amerikohl Mining Inc → Amerikohl Mine #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:** Medved Harold-Gerald & Robert → Amerikohl Mine #2; 1976-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John M  Stilley → Amerikohl Mine #2; 1979-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medved Mining Company → Amerikohl Mine #2; 1986-09-01 to 1988-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Medved Harold-Gerald & Robert → Medved Mining Company; 1986-09-01 to 1988-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Amerikohl Mining Inc → Amerikohl Mine #2; 1988-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Stilley → Amerikohl Mining Inc; 1988-06-29 to current/open; source msha-controller-operator-history