# Relationship history for MSHA mine 4606254

Current hierarchy: **Tucker Dennis → Tucker Enterprises → No 1 Surface**

- 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:** Cecil David E → No 1 Surface; 1980-05-27 to 1985-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Clean Minerals Inc → No 1 Surface; 1980-11-01 to 1980-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Cecil David E → Clean Minerals Inc; 1980-11-01 to 1980-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Tucker Enterprises → No 1 Surface; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tucker Dennis Et Al → No 1 Surface; 1981-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tucker Dennis Et Al → Tucker Enterprises; 1981-01-01 to current/open; source msha-controller-operator-history