# Relationship history for MSHA mine 4103704

Current hierarchy: **Taylor County-Tx → Taylor County Precinct 4 → KENDALL GRAVEL PIT**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Taylor County Precinct 4 → KENDALL GRAVEL PIT; 1991-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taylor County-Tx → KENDALL GRAVEL PIT; 1991-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taylor County-Tx → Taylor County Precinct 4; 1991-12-01 to current/open; source msha-controller-operator-history