# Relationship history for MSHA mine 3602713

Current hierarchy: **Jem Holdings Inc → Power Operating Company Inc → Frenchtown & Beaver**

- 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:** Power Contracting Company Inc → Frenchtown & Beaver; 1950-01-01 to 1978-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Beatrice H  Avery → Frenchtown & Beaver; 1950-01-01 to 1978-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Beatrice H  Avery → Power Contracting Company Inc; 1950-01-01 to 1978-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Power Operating Company Inc → Frenchtown & Beaver; 1978-05-10 to 1995-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Ryan Group Ltd → Frenchtown & Beaver; 1978-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan Group Ltd → Power Operating Company Inc; 1978-05-10 to 1995-10-25; source msha-controller-operator-history
- **operator_operates_mine:** Power Operating Company Inc → Frenchtown & Beaver; 1995-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jem Holdings Inc → Frenchtown & Beaver; 1995-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jem Holdings Inc → Power Operating Company Inc; 1995-10-26 to current/open; source msha-controller-operator-history