# Relationship history for MSHA mine 4400723

Current hierarchy: **Metinvest B V → Patrick Coal Corp → No 3 Prep Plant**

- 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:** Ratliff John W → No 3 Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lynn Camp Coal Company → No 3 Prep Plant; 1950-01-01 to 1976-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Farris Harold & Ronald Elliott → No 3 Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Farris Harold & Ronald Elliott → Lynn Camp Coal Company; 1950-01-01 to 1976-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Black Nuggett Coal Company Inc → No 3 Prep Plant; 1976-03-01 to 1978-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff John W → Black Nuggett Coal Company Inc; 1976-03-01 to 1978-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Patrick Coal Corp → No 3 Prep Plant; 1978-03-01 to 1984-05-22; source msha-controller-operator-history
- **controller_controls_mine:** Patrick Petroleum Corp Of Michigan → No 3 Prep Plant; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick Petroleum Corp Of Michigan → Patrick Coal Corp; 1978-03-01 to 1984-05-22; source msha-controller-operator-history
- **operator_operates_mine:** Patrick Coal Corp → No 3 Prep Plant; 1984-05-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → No 3 Prep Plant; 1984-05-23 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Patrick Coal Corp; 1984-05-23 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Metinvest B V → No 3 Prep Plant; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metinvest B V → Patrick Coal Corp; 2009-04-30 to current/open; source msha-controller-operator-history