# Relationship history for MSHA mine 3201036

Current hierarchy: **Larry  Hofmann; Curtis  Waldie → Sundhagen Sand & Gravel, Inc. → Sundhagen Plant #2**

- 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:** Larry  Hofmann et al → Sundhagen Plant #2; 2014-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sundhagen Sand & Gravel, Inc. → Sundhagen Plant #2; 2014-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Hofmann et al → Sundhagen Sand & Gravel, Inc.; 2014-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curtis  Waldie et al → Sundhagen Sand & Gravel, Inc.; 2014-07-10 to current/open; source msha-controller-operator-history