# Relationship history for MSHA mine 1505082

Current hierarchy: **Turner Robert → Middle Tennessee Coal & Coke Inc → Middle Tennessee Tipple**

- 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:** Kaneb Services Inc → Middle Tennessee Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Contracting Company → Middle Tennessee Tipple; 1972-01-01 to 1977-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Kaneb Services Inc → Appalachian Contracting Company; 1972-01-01 to 1977-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Middle Tennessee Coal & Coke Inc → Middle Tennessee Tipple; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Turner Robert → Middle Tennessee Tipple; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Turner Robert → Middle Tennessee Coal & Coke Inc; 1977-03-01 to current/open; source msha-controller-operator-history