# Relationship history for MSHA mine 4601343

Current hierarchy: **Wolfe Boyd M & Thomas Underwood → U & W Coal Company → No 11 Mine**

- 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:** Imperial Colliery Company → No 11 Mine; 1950-01-01 to 1980-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Christian C Lynch Iii Et Al → No 11 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christian C Lynch Iii Et Al → Imperial Colliery Company; 1950-01-01 to 1980-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Barrdaw Inc → No 11 Mine; 1980-12-01 to 1981-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Dawson James E → No 11 Mine; 1980-12-01 to 1981-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Dawson James E → Barrdaw Inc; 1980-12-01 to 1981-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Barrdaw Inc → No 11 Mine; 1981-03-26 to 1981-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Wolfe Boyd → No 11 Mine; 1981-03-26 to 1981-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Wolfe Boyd → Barrdaw Inc; 1981-03-26 to 1981-06-11; source msha-controller-operator-history
- **operator_operates_mine:** U & W Coal Company → No 11 Mine; 1981-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wolfe Boyd M & Thomas Underwood → No 11 Mine; 1981-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wolfe Boyd M & Thomas Underwood → U & W Coal Company; 1981-06-12 to current/open; source msha-controller-operator-history