# Relationship history for MSHA mine 4405952

Current hierarchy: **Smith Roger → Rogers Coal Co Inc → Mine No 7**

- 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 Roger → Mine No 7; 1974-04-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Coal Co Inc → Mine No 7; 1982-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Roger → Rogers Coal Co Inc; 1982-10-01 to current/open; source msha-controller-operator-history