# Relationship history for MSHA mine 2003577

Current hierarchy: **Allan Lee  VanSloten → Northern Sand & Gravel → Screen 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:** Raymond  Van Sloten → Screen Plant 2; 1988-04-20 to 2012-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Allan Lee  VanSloten → Screen Plant 2; 2012-10-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northern Sand & Gravel → Screen Plant 2; 2019-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allan Lee  VanSloten → Northern Sand & Gravel; 2019-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Van Sloten → Northern Sand & Gravel; 2019-05-15 to 2012-10-16; source msha-controller-operator-history