# Relationship history for MSHA mine 4604208

Current hierarchy: **Quaker State Corp → Shrewsbury Coal Company → V C #46**

- 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:** Quaker State Corp → V C #46; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Central Penn Industries Inc → V C #46; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Princess Susan Coal Company → V C #46; 1974-08-05 to 1979-10-17; source msha-controller-operator-history
- **controller_controls_operator:** Central Penn Industries Inc → Princess Susan Coal Company; 1974-08-05 to 1979-10-17; source msha-controller-operator-history
- **operator_operates_mine:** Valley Camp Coal Company → V C #46; 1979-10-18 to 1981-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Quaker State Corp → Valley Camp Coal Company; 1979-10-18 to 1981-08-30; source msha-controller-operator-history
- **operator_operates_mine:** Princess Susan Coal Company → V C #46; 1981-08-31 to 1982-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Central Penn Industries Inc → Princess Susan Coal Company; 1981-08-31 to 1982-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Shrewsbury Coal Company → V C #46; 1982-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quaker State Corp → Shrewsbury Coal Company; 1982-03-31 to current/open; source msha-controller-operator-history