# Relationship history for MSHA mine 4604257

Current hierarchy: **Roberts Charles Billy → Crazy Horse Enterprise Inc → 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:** S & S Coal Company → No 2 Mine; 1974-06-12 to 1975-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Sizemore James N → No 2 Mine; 1974-06-12 to 1975-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Sizemore James N → S & S Coal Company; 1974-06-12 to 1975-06-30; source msha-controller-operator-history
- **operator_operates_mine:** S & S Coal Company → No 2 Mine; 1975-07-01 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Addair Oliver S → No 2 Mine; 1975-07-01 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Addair Oliver S → S & S Coal Company; 1975-07-01 to 1986-03-31; source msha-controller-operator-history
- **operator_operates_mine:** S & S Coal Company Inc → No 2 Mine; 1986-04-01 to 1987-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Morris F A → No 2 Mine; 1986-04-01 to 1987-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Morris F A → S & S Coal Company Inc; 1986-04-01 to 1987-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Crazy Horse Enterprise Inc → No 2 Mine; 1987-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roberts Charles Billy → No 2 Mine; 1987-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Charles Billy → Crazy Horse Enterprise Inc; 1987-06-23 to current/open; source msha-controller-operator-history