# Relationship history for MSHA mine 1511158

Current hierarchy: **Burgess David → L M B River Coal Company Inc → No 3 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

- **controller_controls_mine:** Preece Homer & George → No 3 Mine; 1977-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Preece Enterprises Inc → No 3 Mine; 1978-04-01 to 1978-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Preece Homer & George → Preece Enterprises Inc; 1978-04-01 to 1978-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Bevins & Keene Coal Company → No 3 Mine; 1978-05-05 to 1979-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Bevins William T & Michael R Keene → No 3 Mine; 1978-05-05 to 1979-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Bevins William T & Michael R Keene → Bevins & Keene Coal Company; 1978-05-05 to 1979-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Reynolds Billy Joe--P J Hurley & Charles Dixon → No 3 Mine; 1978-05-23 to 1981-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Merit Coal Company Inc → No 3 Mine; 1979-04-24 to 1981-02-24; source msha-controller-operator-history
- **controller_controls_operator:** Reynolds Billy Joe--P J Hurley & Charles Dixon → Merit Coal Company Inc; 1979-04-24 to 1981-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Burgess David → No 3 Mine; 1981-01-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L M B River Coal Company Inc → No 3 Mine; 1981-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burgess David → L M B River Coal Company Inc; 1981-02-25 to current/open; source msha-controller-operator-history