# Relationship history for MSHA mine 1508967

Current hierarchy: **Walsh Eugene & William J Morse → Rough River Coal Company Inc → Rough River Coal No 1 Strip**

- 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:** Walsh Eugene & William J Morse → Rough River Coal No 1 Strip; 1974-11-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ramirez & Fowler Construction → Rough River Coal No 1 Strip; 1975-09-22 to 1975-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Fowler Larry & Felipe Ramirez → Rough River Coal No 1 Strip; 1975-09-22 to 1975-12-07; source msha-controller-operator-history
- **controller_controls_operator:** Fowler Larry & Felipe Ramirez → Ramirez & Fowler Construction; 1975-09-22 to 1975-12-07; source msha-controller-operator-history
- **operator_operates_mine:** Rough River Coal Company Inc → Rough River Coal No 1 Strip; 1975-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walsh Eugene & William J Morse → Rough River Coal Company Inc; 1975-12-08 to current/open; source msha-controller-operator-history