# Relationship history for MSHA mine 1515640

Current hierarchy: **Wesley  Childers → Bevins & Bolden Coal Company Inc → No 1**

- 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:** Childers Spencer & Wesley → No 1; 1980-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & W Coal Company Inc → No 1; 1986-06-01 to 1993-07-06; source msha-controller-operator-history
- **controller_controls_operator:** Childers Spencer & Wesley → T & W Coal Company Inc; 1986-06-01 to 1993-07-06; source msha-controller-operator-history
- **operator_operates_mine:** Bevins & Bolden Coal Company Inc → No 1; 1993-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wesley  Childers → No 1; 1993-07-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wesley  Childers → Bevins & Bolden Coal Company Inc; 1993-07-07 to current/open; source msha-controller-operator-history