# Relationship history for MSHA mine 2102942

Current hierarchy: **Patrick J  Dresel → Dresels Aggregate, 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Warren Steen Construction Inc → Wash Plant #1; 1985-07-01 to 1989-05-16; source msha-controller-operator-history
- **controller_controls_mine:** Warren  Steen → Wash Plant #1; 1985-07-01 to 1989-05-16; source msha-controller-operator-history
- **controller_controls_operator:** Warren  Steen → Warren Steen Construction Inc; 1985-07-01 to 1989-05-16; source msha-controller-operator-history
- **operator_operates_mine:** Dresels Aggregate, Inc. → Wash Plant #1; 1989-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patrick J  Dresel → Wash Plant #1; 1989-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick J  Dresel → Dresels Aggregate, Inc.; 1989-05-17 to current/open; source msha-controller-operator-history