# Relationship history for MSHA mine 2103240

Current hierarchy: **Scott  Wirtjes → Alexandria Gravel Products LLC → Plant #2**

- 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

- **controller_controls_mine:** Scott  Wirtjes → Plant #2; 1997-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alexandria Gravel Products → Plant #2; 2000-05-01 to 2013-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Wirtjes → Alexandria Gravel Products; 2000-05-01 to 2013-10-12; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Wirtjes → Plant #2; 2011-03-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alexandria Gravel Products LLC → Plant #2; 2013-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Wirtjes → Alexandria Gravel Products LLC; 2013-10-13 to current/open; source msha-controller-operator-history