# Relationship history for MSHA mine 1510747

Current hierarchy: **Turner Charles & Bobby Joe Hensley → Wayne Coal Company → Smith No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Wayne Coal Company → Smith No 1 Mine; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Turner Charles & Bobby Joe Hensley → Smith No 1 Mine; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Turner Charles & Bobby Joe Hensley → Wayne Coal Company; 1978-01-01 to current/open; source msha-controller-operator-history