# Relationship history for MSHA mine 2402741

Current hierarchy: **Lonnie  Anderson → United Materials of Great Falls, Inc. → Montana Sand and Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Robert B  McIntyre → Montana Sand and Gravel; 1988-01-01 to 2022-01-18; source msha-controller-operator-history
- **operator_operates_mine:** United Materials of Great Falls, Inc. → Montana Sand and Gravel; 2019-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert B  McIntyre → United Materials of Great Falls, Inc.; 2019-03-16 to 2022-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Lonnie  Anderson → Montana Sand and Gravel; 2022-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lonnie  Anderson → United Materials of Great Falls, Inc.; 2022-01-19 to current/open; source msha-controller-operator-history