# Relationship history for MSHA mine 4605549

Current hierarchy: **Continental Resources & Mineral Corp → Mc Namee Resources Inc → Preparation Plant 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:** Continental Resources & Mineral Corp → Preparation Plant 1; 1975-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Namee Charles R--Jack Robertson & Leonard Hovis → Preparation Plant 1; 1976-09-17 to 1979-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Mc Namee-Cheyenne → Preparation Plant 1; 1977-06-01 to 1978-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Mc Namee Charles R--Jack Robertson & Leonard Hovis → Mc Namee-Cheyenne; 1977-06-01 to 1978-11-01; source msha-controller-operator-history
- **operator_operates_mine:** Mc Namee Resources Inc → Preparation Plant 1; 1978-11-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Continental Resources & Mineral Corp → Mc Namee Resources Inc; 1978-11-02 to current/open; source msha-controller-operator-history