# Relationship history for MSHA mine 3601545

Current hierarchy: **Kassab Jacob & Charles Campbell → Crescent Hills Coal Company Inc → Eclipse**

- 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:** Bell Coal Company → Eclipse; 1950-01-01 to 1974-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Bell Coal Company → Eclipse; 1950-01-01 to 1974-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Bell Coal Company → Bell Coal Company; 1950-01-01 to 1974-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Kassab Jacob & Charles Campbell → Eclipse; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crescent Hills Coal Company Inc → Eclipse; 1974-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kassab Jacob & Charles Campbell → Crescent Hills Coal Company Inc; 1974-08-01 to current/open; source msha-controller-operator-history