# Relationship history for MSHA mine 2402087

Current hierarchy: **Gregory  Lucht → Concrete Material Of Montana → SOUTH BOULDER GRAZZING ASSN PIT**

- 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:** Swan Concrete L L C → SOUTH BOULDER GRAZZING ASSN PIT; 1996-04-01 to 1999-07-02; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Swan → SOUTH BOULDER GRAZZING ASSN PIT; 1996-04-01 to 1999-07-02; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Swan → Swan Concrete L L C; 1996-04-01 to 1999-07-02; source msha-controller-operator-history
- **operator_operates_mine:** Concrete Material Of Montana → SOUTH BOULDER GRAZZING ASSN PIT; 1999-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gregory  Lucht → SOUTH BOULDER GRAZZING ASSN PIT; 1999-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregory  Lucht → Concrete Material Of Montana; 1999-07-03 to current/open; source msha-controller-operator-history