# Relationship history for MSHA mine 1100236

Current hierarchy: **Helm Group Inc → Conmat Inc., dba Helm Materials → 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:** E Wienen & Sons Construction Company Inc → Wash Plant 1; 1950-01-01 to 1988-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Harold E  Wienen → Wash Plant 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold E  Wienen → E Wienen & Sons Construction Company Inc; 1950-01-01 to 1988-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Helm Group Inc → Wash Plant 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Galena Stone Products Inc → Wash Plant 1; 1988-03-30 to 1995-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Lois J  Wienen → Wash Plant 1; 1988-03-30 to 1995-08-20; source msha-controller-operator-history
- **controller_controls_operator:** Lois J  Wienen → Galena Stone Products Inc; 1988-03-30 to 1995-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Conmat Inc., dba Helm Materials → Wash Plant 1; 1995-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Helm Group Inc → Conmat Inc., dba Helm Materials; 1995-08-21 to current/open; source msha-controller-operator-history