# Relationship history for MSHA mine 2501233

Current hierarchy: **Michael  Werner → Werner Aggregates, Inc. → PORTABLE DREDGE #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

- **controller_controls_mine:** Philip F  Werner Jr et al → PORTABLE DREDGE #1; 1950-01-01 to 2025-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Werner Aggregates, Inc. → PORTABLE DREDGE #1; 2007-04-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Philip F  Werner Jr et al → Werner Aggregates, Inc.; 2007-04-11 to 2025-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Werner → PORTABLE DREDGE #1; 2025-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Werner → Werner Aggregates, Inc.; 2025-03-26 to current/open; source msha-controller-operator-history