# Relationship history for MSHA mine 3303710

Current hierarchy: **Randall A  Leishman; David L  Leishman → C.A.M. Co. → C.A.M. Co. Auger #3**

- 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:** Randall A  Leishman et al → C.A.M. Co. Auger #3; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C.A.M. Co. → C.A.M. Co. Auger #3; 1978-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall A  Leishman et al → C.A.M. Co.; 1978-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David L  Leishman et al → C.A.M. Co.; 1978-10-01 to current/open; source msha-controller-operator-history