# Relationship history for MSHA mine 1514735

Current hierarchy: **Burkhart Lloyd-Dennis R Smith → C & H Coal Company → 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:** B & B Coal Company → No 1 Mine; 1984-07-01 to 1985-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Burke Richard → No 1 Mine; 1984-07-01 to 1985-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Burke Richard → B & B Coal Company; 1984-07-01 to 1985-07-16; source msha-controller-operator-history
- **operator_operates_mine:** C & H Coal Company → No 1 Mine; 1985-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burkhart Lloyd-Dennis R Smith Et Al → No 1 Mine; 1985-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burkhart Lloyd-Dennis R Smith Et Al → C & H Coal Company; 1985-07-17 to current/open; source msha-controller-operator-history