# Relationship history for MSHA mine 4606972

Current hierarchy: **Morgan Oscar → Sidewinder Contracting Inc → Mine 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Sidewinder Contracting Inc → Mine No 1; 1985-07-01 to 1986-03-27; source msha-controller-operator-history
- **controller_controls_mine:** Cook Terry E → Mine No 1; 1985-07-01 to 1986-03-27; source msha-controller-operator-history
- **controller_controls_operator:** Cook Terry E → Sidewinder Contracting Inc; 1985-07-01 to 1986-03-27; source msha-controller-operator-history
- **operator_operates_mine:** Sidewinder Contracting Inc → Mine No 1; 1986-03-28 to 1987-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Harrison John T → Mine No 1; 1986-03-28 to 1987-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Harrison John T → Sidewinder Contracting Inc; 1986-03-28 to 1987-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Sidewinder Contracting Inc → Mine No 1; 1987-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Morgan Oscar → Mine No 1; 1987-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morgan Oscar → Sidewinder Contracting Inc; 1987-05-12 to current/open; source msha-controller-operator-history