# Relationship history for MSHA mine 3303679

Current hierarchy: **Cancelli Dennis → Lydia Coal Company → Francis Strip**

- 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:** Lydia Coal Company → Francis Strip; 1978-02-01 to 1978-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Fred G → Francis Strip; 1978-02-01 to 1978-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Fred G → Lydia Coal Company; 1978-02-01 to 1978-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Lydia Coal Company → Francis Strip; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cancelli Dennis → Francis Strip; 1978-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cancelli Dennis → Lydia Coal Company; 1978-09-01 to current/open; source msha-controller-operator-history