# Relationship history for MSHA mine 1516748

Current hierarchy: **William Ridley  Elkins Jr → Clas Coal Company Inc → No 1 Deep**

- 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:** Wesley D.  Burke et al → No 1 Deep; 1986-07-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fairbanks Coal Company Inc → No 1 Deep; 1989-10-01 to 1993-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Wesley D.  Burke et al → Fairbanks Coal Company Inc; 1989-10-01 to 1993-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Clas Coal Company Inc → No 1 Deep; 1993-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William Ridley  Elkins Jr → No 1 Deep; 1993-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William Ridley  Elkins Jr → Clas Coal Company Inc; 1993-11-01 to current/open; source msha-controller-operator-history