# Relationship history for MSHA mine 1601569

Current hierarchy: **R Lance  West → CASH SAND & GRAVEL, INC. → KEMP PLANT**

- 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

- **controller_controls_mine:** R Lance  West → KEMP PLANT; 2007-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CASH SAND & GRAVEL, INC. → KEMP PLANT; 2017-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R Lance  West → CASH SAND & GRAVEL, INC.; 2017-05-08 to current/open; source msha-controller-operator-history