# Relationship history for MSHA mine 3606896

Current hierarchy: **John W  Rich (Pa) → Gilberton Coal Company → Potts Mine #1**

- 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:** John W  Rich (Pa) → Potts Mine #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gilberton Coal Company → Potts Mine #1; 1979-11-01 to 2004-10-25; source msha-controller-operator-history
- **controller_controls_operator:** John W  Rich (Pa) → Gilberton Coal Company; 1979-11-01 to 2004-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Randy C  Troup → Potts Mine #1; 1997-09-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Schuylkill Land Developers → Potts Mine #1; 2004-10-26 to 2024-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Randy C  Troup → Schuylkill Land Developers; 2004-10-26 to 2024-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Gilberton Coal Company → Potts Mine #1; 2024-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John W  Rich (Pa) → Gilberton Coal Company; 2024-02-01 to current/open; source msha-controller-operator-history