# Relationship history for MSHA mine 4604904

Current hierarchy: **Jeffery Gary A → South Bank Coal Company Inc → No 4 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:** South Bank Coal Company Inc → No 4 Mine; 1975-12-18 to 1977-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Carpenter Frank → No 4 Mine; 1975-12-18 to 1985-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Carpenter Frank → South Bank Coal Company Inc; 1975-12-18 to 1977-06-14; source msha-controller-operator-history
- **operator_operates_mine:** South Bank Coal Company → No 4 Mine; 1977-06-15 to 1979-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Sizemore James N → No 4 Mine; 1977-06-15 to 1979-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Sizemore James N → South Bank Coal Company; 1977-06-15 to 1979-05-09; source msha-controller-operator-history
- **operator_operates_mine:** South Bank Coal Company Inc → No 4 Mine; 1979-05-10 to 1981-05-25; source msha-controller-operator-history
- **controller_controls_mine:** Jeffery Gary A → No 4 Mine; 1979-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffery Gary A → South Bank Coal Company Inc; 1979-05-10 to 1981-05-25; source msha-controller-operator-history
- **operator_operates_mine:** South Bank Coal Company Inc → No 4 Mine; 1981-05-26 to 1981-08-16; source msha-controller-operator-history
- **controller_controls_mine:** James E  Trent → No 4 Mine; 1981-05-26 to 1981-08-16; source msha-controller-operator-history
- **controller_controls_operator:** James E  Trent → South Bank Coal Company Inc; 1981-05-26 to 1981-08-16; source msha-controller-operator-history
- **operator_operates_mine:** South Bank Coal Company Inc → No 4 Mine; 1981-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffery Gary A → South Bank Coal Company Inc; 1981-08-17 to current/open; source msha-controller-operator-history