# Relationship history for MSHA mine 4003070

Current hierarchy: **Dennis W Patterson; Dustin  Patterson → Tri County Investments LLC → TRI COUNTY STONE**

- 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:** Union Aggregates Inc → TRI COUNTY STONE; 1992-06-01 to 2017-12-10; source msha-controller-operator-history
- **controller_controls_mine:** Kevin L  Gaerke Et Al → TRI COUNTY STONE; 1992-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin L  Gaerke Et Al → Union Aggregates Inc; 1992-06-01 to 2017-12-10; source msha-controller-operator-history
- **operator_operates_mine:** Tri County Investments LLC → TRI COUNTY STONE; 2017-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis W Patterson et al → TRI COUNTY STONE; 2017-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis W Patterson et al → Tri County Investments LLC; 2017-12-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dustin  Patterson et al → Tri County Investments LLC; 2017-12-11 to current/open; source msha-controller-operator-history