# Relationship history for MSHA mine 3608102

Current hierarchy: **Erickson Charles Jr → Redstone Mining Inc → Merrill 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:** Fetterolf Donald L → Merrill Strip; 1979-05-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Commonwealth Coals Inc → Merrill Strip; 1989-08-01 to 1992-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Fetterolf Donald L → Commonwealth Coals Inc; 1989-08-01 to 1992-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Redstone Mining Inc → Merrill Strip; 1992-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Erickson Charles Jr Et Al → Merrill Strip; 1992-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Erickson Charles Jr Et Al → Redstone Mining Inc; 1992-06-29 to current/open; source msha-controller-operator-history