# Relationship history for MSHA mine 1300012

Current hierarchy: **Ron J  Beach; Gary L  Weihs → Natural Materials LLC → Shop-Natural Materials LLC**

- 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:** Clark Limestone Company → Shop-Natural Materials LLC; 1950-01-01 to 1998-01-12; source msha-controller-operator-history
- **controller_controls_mine:** Don M  Clark → Shop-Natural Materials LLC; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don M  Clark → Clark Limestone Company; 1950-01-01 to 1998-01-12; source msha-controller-operator-history
- **operator_operates_mine:** Western Iowa Limestone, Inc. → Shop-Natural Materials LLC; 1998-01-13 to 2006-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Gary A  Hopp → Shop-Natural Materials LLC; 1998-01-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary A  Hopp → Western Iowa Limestone, Inc.; 1998-01-13 to 2006-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Natural Materials LLC → Shop-Natural Materials LLC; 2006-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ron J  Beach et al → Shop-Natural Materials LLC; 2006-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron J  Beach et al → Natural Materials LLC; 2006-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Weihs et al → Natural Materials LLC; 2006-06-12 to current/open; source msha-controller-operator-history