# Relationship history for MSHA mine 4104908

Current hierarchy: **Rachel  Schuler → HEARTLAND QUARRIES LLC → HEARTLAND QUARRIES PIT # 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

- **operator_operates_mine:** JB Stone Company → HEARTLAND QUARRIES PIT # 2; 2011-10-18 to 2017-09-07; source msha-controller-operator-history
- **controller_controls_mine:** Bernardo  Espinoza → HEARTLAND QUARRIES PIT # 2; 2011-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bernardo  Espinoza → JB Stone Company; 2011-10-18 to 2017-09-07; source msha-controller-operator-history
- **controller_controls_mine:** John W  Schuler → HEARTLAND QUARRIES PIT # 2; 2014-06-11 to 2024-04-23; source msha-controller-operator-history
- **operator_operates_mine:** HEARTLAND QUARRIES LLC → HEARTLAND QUARRIES PIT # 2; 2017-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John W  Schuler → HEARTLAND QUARRIES LLC; 2017-09-08 to 2024-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Rachel  Schuler → HEARTLAND QUARRIES PIT # 2; 2024-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rachel  Schuler → HEARTLAND QUARRIES LLC; 2024-04-24 to current/open; source msha-controller-operator-history