# Relationship history for MSHA mine 2103591

Current hierarchy: **Douglas  Omar → Omar's Sand & Gravel, Inc. → Wash Plant #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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Gobel Aggregate Inc → Wash Plant #1; 2007-06-11 to 2022-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Don  Proulx → Wash Plant #1; 2007-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don  Proulx → Gobel Aggregate Inc; 2007-06-11 to 2022-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Douglas  Omar → Wash Plant #1; 2022-01-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Omar's Sand & Gravel, Inc. → Wash Plant #1; 2022-06-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Omar → Omar's Sand & Gravel, Inc.; 2022-06-20 to current/open; source msha-controller-operator-history