# Relationship history for MSHA mine 3603554

Current hierarchy: **Shannopin Mining Company → Crescent Hills Coal Company Inc → Crescent Mine**

- 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:** Crescent Hills Coal Company Inc → Crescent Mine; 1950-01-01 to 1983-09-26; source msha-controller-operator-history
- **controller_controls_mine:** Kassab Jacob & Charles Campbell → Crescent Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kassab Jacob & Charles Campbell → Crescent Hills Coal Company Inc; 1950-01-01 to 1983-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Crescent Hills Coal Company Inc → Crescent Mine; 1983-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shannopin Mining Company → Crescent Mine; 1983-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shannopin Mining Company → Crescent Hills Coal Company Inc; 1983-09-27 to current/open; source msha-controller-operator-history