# Relationship history for MSHA mine 4606552

Current hierarchy: **Elkins Archie → Arch Coal Company Inc → Dola #1**

- 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:** Virgil B  La Rosa → Dola #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cheyenne Sales Company Inc → Dola #1; 1982-07-01 to 1983-01-12; source msha-controller-operator-history
- **controller_controls_operator:** Virgil B  La Rosa → Cheyenne Sales Company Inc; 1982-07-01 to 1983-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Arch Coal Company Inc → Dola #1; 1983-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elkins Archie → Dola #1; 1983-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elkins Archie → Arch Coal Company Inc; 1983-01-13 to current/open; source msha-controller-operator-history