# Relationship history for MSHA mine 1509615

Current hierarchy: **Tackett Sola → Ligon Preparation Company → No I-210 Mine**

- 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:** Ligon Preparation Company → No I-210 Mine; 1976-03-03 to 1979-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Eugene → No I-210 Mine; 1976-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Eugene → Ligon Preparation Company; 1976-03-03 to 1979-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Ligon Preparation Company → No I-210 Mine; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Sola → No I-210 Mine; 1979-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Sola → Ligon Preparation Company; 1979-02-01 to current/open; source msha-controller-operator-history