# Relationship history for MSHA mine 4606300

Current hierarchy: **Forman Loyal Jr & Clifford D Titchenell → B & D Coal Company → Mine No 1**

- 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:** S & W Construction → Mine No 1; 1981-02-01 to 1983-08-02; source msha-controller-operator-history
- **controller_controls_mine:** Smith David F → Mine No 1; 1981-02-01 to 1983-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Smith David F → S & W Construction; 1981-02-01 to 1983-08-02; source msha-controller-operator-history
- **operator_operates_mine:** B & D Coal Company → Mine No 1; 1983-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Forman Loyal Jr & Clifford D Titchenell → Mine No 1; 1983-08-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Forman Loyal Jr & Clifford D Titchenell → B & D Coal Company; 1983-08-03 to current/open; source msha-controller-operator-history