# Relationship history for MSHA mine 1511920

Current hierarchy: **Thacker Gene P → Takex Inc → No 1-A Surface**

- 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:** Thacker Gene P → No 1-A Surface; 1979-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Takex Inc → No 1-A Surface; 1979-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thacker Gene P → Takex Inc; 1979-06-01 to current/open; source msha-controller-operator-history