# Relationship history for MSHA mine 4605777

Current hierarchy: **Collins Ted → Oakwood Fuel Inc → Mine No 52**

- 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:** Collins Ted → Mine No 52; 1976-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stepp Gale B → Mine No 52; 1977-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pine Tree Coal Company → Mine No 52; 1978-04-01 to 1979-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Stepp Gale B → Pine Tree Coal Company; 1978-04-01 to 1979-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Oakwood Fuel Inc → Mine No 52; 1979-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collins Ted → Oakwood Fuel Inc; 1979-07-10 to current/open; source msha-controller-operator-history