# Relationship history for MSHA mine 1513733

Current hierarchy: **Tedrick Robert B → Belam Development Corp Inc → Belam #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:** E & D Coal Company → Belam #1; 1982-09-01 to 1983-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Vaughn Estille & Dennis R Caldwell → Belam #1; 1982-09-01 to 1983-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Vaughn Estille & Dennis R Caldwell → E & D Coal Company; 1982-09-01 to 1983-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Sand Hill Coal Company → Belam #1; 1983-06-30 to 1984-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Crawford Larry-Tony Mc Cullough Et Al → Belam #1; 1983-06-30 to 1984-07-19; source msha-controller-operator-history
- **controller_controls_operator:** Crawford Larry-Tony Mc Cullough Et Al → Sand Hill Coal Company; 1983-06-30 to 1984-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Belam Development Corp Inc → Belam #1; 1984-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tedrick Robert B → Belam #1; 1984-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tedrick Robert B → Belam Development Corp Inc; 1984-07-20 to current/open; source msha-controller-operator-history