# Relationship history for MSHA mine 0301706

Current hierarchy: **Jeff  Burrow → Crystal City Inc → Crystal Point**

- 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:** Jeff  Burrow et al → Crystal Point; 1987-08-01 to 2021-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Crystal City Inc → Crystal Point; 1990-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Burrow et al → Crystal City Inc; 1990-02-01 to 2021-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Don  Burrow  et al → Crystal City Inc; 1990-02-01 to 2021-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Burrow → Crystal Point; 2021-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Burrow → Crystal City Inc; 2021-10-13 to current/open; source msha-controller-operator-history