# Relationship history for MSHA mine 3603358

Current hierarchy: **Goetz William O → Oil City Coal Inc → Oil City Coal Inc Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** William O Goetz Coal Co → Oil City Coal Inc Strip; 1950-01-01 to 1975-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Goetz William O → Oil City Coal Inc Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Goetz William O → William O Goetz Coal Co; 1950-01-01 to 1975-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Oil City Coal Inc → Oil City Coal Inc Strip; 1976-01-01 to 1977-02-16; source msha-controller-operator-history
- **controller_controls_mine:** Oil City Coal Inc → Oil City Coal Inc Strip; 1976-01-01 to 1977-02-16; source msha-controller-operator-history
- **controller_controls_operator:** Oil City Coal Inc → Oil City Coal Inc; 1976-01-01 to 1977-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Paul C Harman Company Inc → Oil City Coal Inc Strip; 1977-02-17 to 1977-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Carroll Coal Company Inc → Oil City Coal Inc Strip; 1977-02-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carroll Coal Company Inc → Paul C Harman Company Inc; 1977-02-17 to 1977-04-11; source msha-controller-operator-history
- **operator_operates_mine:** Oil City Coal Inc → Oil City Coal Inc Strip; 1977-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Goetz William O → Oil City Coal Inc Strip; 1977-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Goetz William O → Oil City Coal Inc; 1977-04-12 to current/open; source msha-controller-operator-history