# Relationship history for MSHA mine 1508474

Current hierarchy: **Wright Larry → Ideal Coal Company → No 1 Mine (D)**

- 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

- **operator_operates_mine:** Ideal Coal Company Inc → No 1 Mine (D); 1974-01-01 to 1978-03-21; source msha-controller-operator-history
- **controller_controls_mine:** Asbury Elbert → No 1 Mine (D); 1974-01-01 to 1978-03-21; source msha-controller-operator-history
- **controller_controls_operator:** Asbury Elbert → Ideal Coal Company Inc; 1974-01-01 to 1978-03-21; source msha-controller-operator-history
- **operator_operates_mine:** Ideal Coal Company → No 1 Mine (D); 1978-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wright Larry → No 1 Mine (D); 1978-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wright Larry → Ideal Coal Company; 1978-03-22 to current/open; source msha-controller-operator-history