# Relationship history for MSHA mine 1508042

Current hierarchy: **Hall Jay → Quadrex Inc → No 2**

- 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:** Salmons Carlos → No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & M Mining Company Inc → No 2; 1975-02-11 to 1977-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Salmons Carlos → C & M Mining Company Inc; 1975-02-11 to 1977-01-02; source msha-controller-operator-history
- **operator_operates_mine:** R & R Coal Company Inc → No 2; 1977-01-03 to 1978-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Runyon Chester → No 2; 1977-01-03 to 1978-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Runyon Chester → R & R Coal Company Inc; 1977-01-03 to 1978-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Reliance Coal Company Inc → No 2; 1978-04-05 to 1986-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Basic American Industries → No 2; 1978-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Basic American Industries → Reliance Coal Company Inc; 1978-04-05 to 1986-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Hall Jay Et Al → No 2; 1984-03-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quadrex Inc → No 2; 1986-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Jay Et Al → Quadrex Inc; 1986-04-23 to current/open; source msha-controller-operator-history