# Relationship history for MSHA mine 1510314

Current hierarchy: **Smith E Dennis → Ben Le Coal Corp → Prep Plant #2**

- 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:** Smith E Dennis → Prep Plant #2; 1975-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ben Le Coal Corp → Prep Plant #2; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith E Dennis → Ben Le Coal Corp; 1977-03-01 to current/open; source msha-controller-operator-history