# Relationship history for MSHA mine 1506237

Current hierarchy: **Jones Edgar → Crescent Coal Company → No 1 Tipple**

- 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:** Jones Edgar Et Al → No 1 Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carson Coal Corp → No 1 Tipple; 1950-01-01 to 1972-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Carson Coal Corp → No 1 Tipple; 1950-01-01 to 1972-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Carson Coal Corp → Carson Coal Corp; 1950-01-01 to 1972-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Jade Coal Company Inc → No 1 Tipple; 1972-12-02 to 1975-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Jones Edgar Et Al → Jade Coal Company Inc; 1972-12-02 to 1975-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Crescent Coal Company → No 1 Tipple; 1975-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jones Edgar Et Al → No 1 Tipple; 1975-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones Edgar Et Al → Crescent Coal Company; 1975-08-28 to current/open; source msha-controller-operator-history