# Relationship history for MSHA mine 1700650

Current hierarchy: **Alan  Dorr → Alan Dorr Contracting → TELESCREEN 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Alan Dorr Contracting → TELESCREEN PLANT; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alan  Dorr → TELESCREEN PLANT; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alan  Dorr → Alan Dorr Contracting; 1999-04-01 to current/open; source msha-controller-operator-history