# Relationship history for MSHA mine 3606540

Current hierarchy: **Fetterolf Group Inc → Bituminous Coals Inc → Addison #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

- **operator_operates_mine:** Bituminous Coals Inc → Addison #1; 1977-10-01 to 1979-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Mowry W Thomas → Addison #1; 1977-10-01 to 1979-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Mowry W Thomas → Bituminous Coals Inc; 1977-10-01 to 1979-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Bituminous Coals Inc → Addison #1; 1979-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fetterolf Group Inc → Addison #1; 1979-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fetterolf Group Inc → Bituminous Coals Inc; 1979-01-22 to current/open; source msha-controller-operator-history