# Relationship history for MSHA mine 1508318

Current hierarchy: **Lester David F → Franklin Mining Inc → No 1 Phipps Fork Surface 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:** Franklin Mining Inc → No 1 Phipps Fork Surface Mine; 1975-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lester David F → No 1 Phipps Fork Surface Mine; 1975-03-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lester David F → Franklin Mining Inc; 1975-03-14 to current/open; source msha-controller-operator-history