# Relationship history for MSHA mine 4607342

Current hierarchy: **Cheyenne Mining Corp → Blackfoot Mining Inc → No 2**

- 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

- **controller_controls_mine:** Cheyenne Mining Corp → No 2; 1984-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Triple E Construction Company Inc → No 2; 1987-08-01 to 1987-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Epling Walter Ben & Michael R → No 2; 1987-08-01 to 1987-11-01; source msha-controller-operator-history
- **controller_controls_operator:** Epling Walter Ben & Michael R → Triple E Construction Company Inc; 1987-08-01 to 1987-11-01; source msha-controller-operator-history
- **operator_operates_mine:** Triple E Construction Company Inc → No 2; 1987-11-02 to 1990-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Blake → No 2; 1987-11-02 to 1990-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Blake → Triple E Construction Company Inc; 1987-11-02 to 1990-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Blackfoot Mining Inc → No 2; 1990-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cheyenne Mining Corp → Blackfoot Mining Inc; 1990-03-07 to current/open; source msha-controller-operator-history