# Relationship history for MSHA mine 1514573

Current hierarchy: **Prater Taylor → Prater & Baldridge Coal Company Inc → No #3**

- 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:** Daugherty Donald R → No #3; 1982-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Davidson Michael W → No #3; 1983-08-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wind River Corp → No #3; 1984-04-01 to 1984-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Davidson Michael W → Wind River Corp; 1984-04-01 to 1984-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Newsome Donald → No #3; 1984-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Daugherty Coal Company Inc → No #3; 1984-05-21 to 1985-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Daugherty Donald R → Daugherty Coal Company Inc; 1984-05-21 to 1985-09-11; source msha-controller-operator-history
- **operator_operates_mine:** J & N Coal Company Inc → No #3; 1985-09-12 to 1986-04-16; source msha-controller-operator-history
- **controller_controls_operator:** Newsome Donald → J & N Coal Company Inc; 1985-09-12 to 1986-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Prater Taylor → No #3; 1985-10-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Prater & Baldridge Coal Company Inc → No #3; 1986-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Prater Taylor → Prater & Baldridge Coal Company Inc; 1986-04-17 to current/open; source msha-controller-operator-history