# Relationship history for MSHA mine 4605098

Current hierarchy: **Steele Roger P → C & T Excavating Company → No 3 Surface**

- 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:** Crew Willis → No 3 Surface; 1975-03-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & T Excavating Inc → No 3 Surface; 1976-04-08 to 1977-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Crew Willis → C & T Excavating Inc; 1976-04-08 to 1977-07-13; source msha-controller-operator-history
- **operator_operates_mine:** C & T Excavating Company → No 3 Surface; 1977-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steele Roger P → No 3 Surface; 1977-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steele Roger P → C & T Excavating Company; 1977-07-14 to current/open; source msha-controller-operator-history