# Relationship history for MSHA mine 1505061

Current hierarchy: **Corum Larry & Jo Ann → Kentucky Mountain Coal Company Inc → Prep Plant**

- 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:** Kentucky Mountain Coal Company → Prep Plant; 1950-01-01 to 1988-03-28; source msha-controller-operator-history
- **controller_controls_mine:** Bnecker - Norris Ralkos Coal Corp → Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bnecker - Norris Ralkos Coal Corp → Kentucky Mountain Coal Company; 1950-01-01 to 1988-03-28; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Mountain Coal Company Inc → Prep Plant; 1988-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Corum Larry & Jo Ann → Prep Plant; 1988-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corum Larry & Jo Ann → Kentucky Mountain Coal Company Inc; 1988-03-29 to current/open; source msha-controller-operator-history