# Relationship history for MSHA mine 4403482

Current hierarchy: **Coleman Hufford-Mary Ruth → Blue Chip Coal Corp → No 2 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:** Lois Coal Company → No 2 Mine; 1950-01-01 to 1974-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Lois Coal Company → No 2 Mine; 1950-01-01 to 1974-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Lois Coal Company → Lois Coal Company; 1950-01-01 to 1974-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Triple C Coal Co Inc → No 2 Mine; 1974-06-01 to 1975-09-09; source msha-controller-operator-history
- **controller_controls_mine:** Chambers Charles H → No 2 Mine; 1974-06-01 to 1976-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Chambers Charles H → Triple C Coal Co Inc; 1974-06-01 to 1975-09-09; source msha-controller-operator-history
- **operator_operates_mine:** Blue Chip Coal Corp → No 2 Mine; 1975-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Hufford-Mary Ruth Et Al → No 2 Mine; 1975-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Hufford-Mary Ruth Et Al → Blue Chip Coal Corp; 1975-09-10 to current/open; source msha-controller-operator-history