# Relationship history for MSHA mine 4102770

Current hierarchy: **Mart  Jordan; Taylor  Jordan → Matador Materials → CAMPBELL PIT**

- 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:** Lawson Warner → CAMPBELL PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hale County Sand & Gravel → CAMPBELL PIT; 1978-03-09 to 1988-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Smith George M Jr → CAMPBELL PIT; 1978-03-09 to 1988-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Smith George M Jr → Hale County Sand & Gravel; 1978-03-09 to 1988-08-07; source msha-controller-operator-history
- **operator_operates_mine:** Appian Corp → CAMPBELL PIT; 1988-08-08 to 1995-05-22; source msha-controller-operator-history
- **controller_controls_operator:** Lawson Warner → Appian Corp; 1988-08-08 to 1995-05-22; source msha-controller-operator-history
- **operator_operates_mine:** Matador Materials → CAMPBELL PIT; 1995-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mart  Jordan et al → CAMPBELL PIT; 1995-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mart  Jordan et al → Matador Materials; 1995-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taylor  Jordan et al → Matador Materials; 1995-05-23 to current/open; source msha-controller-operator-history