# Relationship history for MSHA mine 3304483

Current hierarchy: **Howard J  Wenger → Massillon Materials, Inc. → Massillon Materials-Warmington Plant**

- 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

- **controller_controls_mine:** Howard J  Wenger → Massillon Materials-Warmington Plant; 1986-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Massillon Materials, Inc. → Massillon Materials-Warmington Plant; 2001-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard J  Wenger → Massillon Materials, Inc.; 2001-09-11 to current/open; source msha-controller-operator-history