# Relationship history for MSHA mine 2003219

Current hierarchy: **Frank E  Franzel → Tuscola Aggregates → TUSCOLA AGGREGATES**

- 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:** Kramer Excavating → TUSCOLA AGGREGATES; 2001-07-01 to 2002-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Ryan  Kramer → TUSCOLA AGGREGATES; 2001-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ryan  Kramer → Kramer Excavating; 2001-07-01 to 2002-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Tuscola Aggregates → TUSCOLA AGGREGATES; 2002-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank E  Franzel → TUSCOLA AGGREGATES; 2002-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank E  Franzel → Tuscola Aggregates; 2002-07-13 to current/open; source msha-controller-operator-history