# Relationship history for MSHA mine 2902445

Current hierarchy: **Martin E  Urban → Stone Age Sand & Gravel LLC → UTE Sand & Gravel #1**

- 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

- **controller_controls_mine:** Martin E  Urban → UTE Sand & Gravel #1; 2008-05-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Urban Trucking & Excavation, LLC → UTE Sand & Gravel #1; 2015-04-16 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Martin E  Urban → Urban Trucking & Excavation, LLC; 2015-04-16 to 2018-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Stone Age Sand & Gravel LLC → UTE Sand & Gravel #1; 2019-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin E  Urban → UTE Sand & Gravel #1; 2019-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin E  Urban → Stone Age Sand & Gravel LLC; 2019-01-01 to current/open; source msha-controller-operator-history