# Relationship history for MSHA mine 4605060

Current hierarchy: **Crystalee Coal Company → Crystalane Inc → Crystalane Plant**

- 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:** Crystalane Inc → Crystalane Plant; 1976-03-01 to 1976-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Stark William → Crystalane Plant; 1976-03-01 to 1976-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Stark William → Crystalane Inc; 1976-03-01 to 1976-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Crystalane Inc → Crystalane Plant; 1976-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crystalee Coal Company → Crystalane Plant; 1976-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crystalee Coal Company → Crystalane Inc; 1976-07-10 to current/open; source msha-controller-operator-history