# Relationship history for MSHA mine 1510402

Current hierarchy: **Thornberry James T → Carbonex Fuel Corp → No 1 Surface**

- 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:** Ashland Inc et al → No 1 Surface; 1976-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Addington Brothers Mining Inc → No 1 Surface; 1977-04-01 to 1978-06-06; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Addington Brothers Mining Inc; 1977-04-01 to 1978-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Carbonex Fuel Corp → No 1 Surface; 1978-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thornberry James T → No 1 Surface; 1978-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thornberry James T → Carbonex Fuel Corp; 1978-06-07 to current/open; source msha-controller-operator-history