# Relationship history for MSHA mine 1601482

Current hierarchy: **R Lance  West → Cash Sand & Gravel Inc → Linder 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** R Lance  West → Linder Plant; 2007-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cash Sand & Gravel Inc → Linder Plant; 2008-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R Lance  West → Cash Sand & Gravel Inc; 2008-08-18 to current/open; source msha-controller-operator-history