# Relationship history for MSHA mine 1302284

Current hierarchy: **Ron J  Beach; Gary L  Weihs → Natural Materials, L.L.C. → Logan 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:** Gary A  Hopp → Logan Plant; 1998-01-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Iowa Limestone → Logan Plant; 2004-06-10 to 2006-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Gary A  Hopp → Western Iowa Limestone; 2004-06-10 to 2006-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Natural Materials, L.L.C. → Logan Plant; 2006-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary L  Weihs et al → Logan Plant; 2006-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Weihs et al → Natural Materials, L.L.C.; 2006-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron J  Beach et al → Natural Materials, L.L.C.; 2006-06-12 to current/open; source msha-controller-operator-history