# Relationship history for MSHA mine 2003311

Current hierarchy: **Lee A Schunk → Schunk's Enterprises Inc. → Schunk's Enterprises Inc.**

- 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:** Schunks Rock Farm → Schunk's Enterprises Inc.; 2005-03-15 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Lee A Schunk → Schunk's Enterprises Inc.; 2005-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lee A Schunk → Schunks Rock Farm; 2005-03-15 to 2021-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Schunk's Enterprises Inc. → Schunk's Enterprises Inc.; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lee A Schunk → Schunk's Enterprises Inc.; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lee A Schunk → Schunk's Enterprises Inc.; 2022-01-01 to current/open; source msha-controller-operator-history