# Relationship history for MSHA mine 1504025

Current hierarchy: **Harris B W → Diamondback 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Osborne Jack & William L Jr → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & M Mining Company Inc → No 1; 1950-01-01 to 1975-01-06; source msha-controller-operator-history
- **controller_controls_mine:** Salmons Carlos → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salmons Carlos → C & M Mining Company Inc; 1950-01-01 to 1975-01-06; source msha-controller-operator-history
- **operator_operates_mine:** Slater Mining Corp → No 1; 1975-01-07 to 1989-10-03; source msha-controller-operator-history
- **controller_controls_operator:** Osborne Jack & William L Jr → Slater Mining Corp; 1975-01-07 to 1989-10-03; source msha-controller-operator-history
- **operator_operates_mine:** Diamondback Coal Company Inc → No 1; 1989-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harris B W → No 1; 1989-10-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harris B W → Diamondback Coal Company Inc; 1989-10-04 to current/open; source msha-controller-operator-history