# Relationship history for MSHA mine 4102478

Current hierarchy: **Texas United Corp → United Salt Hockley, LLC → HOCKLEY 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:** United Salt Corporation → HOCKLEY MINE; 1950-01-01 to 2013-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Texas United Corp → HOCKLEY MINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Texas United Corp → United Salt Corporation; 1950-01-01 to 2013-12-31; source msha-controller-operator-history
- **operator_operates_mine:** United Salt Hockley, LLC → HOCKLEY MINE; 2014-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Texas United Corp → HOCKLEY MINE; 2014-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Texas United Corp → United Salt Hockley, LLC; 2014-01-01 to current/open; source msha-controller-operator-history