# Relationship history for MSHA mine 3604694

Current hierarchy: **Rochester & Pittsburgh Coal Company → Kent Coal Mining Company → Spring Church 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:** Double A Coal Company → Spring Church Mine; 1950-01-01 to 1983-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Altmire Brothers Coal Company Inc → Spring Church Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Altmire Brothers Coal Company Inc → Double A Coal Company; 1950-01-01 to 1983-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Rochester & Pittsburgh Coal Company → Spring Church Mine; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Double D Coal Company Inc → Spring Church Mine; 1983-07-15 to 1984-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Terry L  Schall → Spring Church Mine; 1983-07-15 to 1984-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Terry L  Schall → Double D Coal Company Inc; 1983-07-15 to 1984-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Kent Coal Mining Company → Spring Church Mine; 1984-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rochester & Pittsburgh Coal Company → Kent Coal Mining Company; 1984-02-03 to current/open; source msha-controller-operator-history