# Relationship history for MSHA mine 4604558

Current hierarchy: **Mc Cann John H & John W Benson → C & T Excavating Company Of Wv → No 1 Tipple**

- 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:** C & T Excavating Inc → No 1 Tipple; 1975-03-24 to 1976-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Crew Willis → No 1 Tipple; 1975-03-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crew Willis → C & T Excavating Inc; 1975-03-24 to 1976-06-15; source msha-controller-operator-history
- **operator_operates_mine:** C & T Excavating Company Of Wv → No 1 Tipple; 1976-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Cann John H & John W Benson → No 1 Tipple; 1976-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Cann John H & John W Benson → C & T Excavating Company Of Wv; 1976-06-16 to current/open; source msha-controller-operator-history