# Relationship history for MSHA mine 4601667

Current hierarchy: **Belco Petroleum Corp → E & P Coal Company Inc → No 1 Mine**

- 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:** Ferrell Camp Coal Company → No 1 Mine; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Kane Ray → No 1 Mine; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Kane Ray → Ferrell Camp Coal Company; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Mark Kay Mining Corp → No 1 Mine; 1973-01-01 to 1974-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Trent Dewey Jr → No 1 Mine; 1973-01-01 to 1974-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Trent Dewey Jr → Mark Kay Mining Corp; 1973-01-01 to 1974-10-16; source msha-controller-operator-history
- **operator_operates_mine:** E & P Coal Company Inc → No 1 Mine; 1974-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Belco Petroleum Corp → No 1 Mine; 1974-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Belco Petroleum Corp → E & P Coal Company Inc; 1974-10-17 to current/open; source msha-controller-operator-history