# Relationship history for MSHA mine 4002849

Current hierarchy: **Taylor Woodrow Construction Ltd → Taywood Mining Inc → Campbell #1 & #2**

- 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:** Taylor Woodrow Construction Ltd → Campbell #1 & #2; 1978-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Spradlin Coal Company → Campbell #1 & #2; 1984-03-01 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Spradlin Ewell L → Campbell #1 & #2; 1984-03-01 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Spradlin Ewell L → Spradlin Coal Company; 1984-03-01 to 1986-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Taywood Mining Inc → Campbell #1 & #2; 1986-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Woodrow Construction Ltd → Taywood Mining Inc; 1986-04-01 to current/open; source msha-controller-operator-history