# Relationship history for MSHA mine 3605104

Current hierarchy: **Oliver J  Smith → V P Smith Co Inc → Mc Broom**

- 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

- **operator_operates_mine:** Smith Coal Company → Mc Broom; 1974-05-01 to 1978-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Ralph T  Smith → Mc Broom; 1974-05-01 to 1978-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Ralph T  Smith → Smith Coal Company; 1974-05-01 to 1978-03-26; source msha-controller-operator-history
- **operator_operates_mine:** V P Smith Co Inc → Mc Broom; 1978-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oliver J  Smith → Mc Broom; 1978-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oliver J  Smith → V P Smith Co Inc; 1978-03-27 to current/open; source msha-controller-operator-history