# Relationship history for MSHA mine 2501213

Current hierarchy: **Michael  Werner → Werner Construction Inc. → Portable Crusher #4**

- 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 Crusher #4; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Werner Construction → Portable Crusher #4; 2002-09-03 to 2011-11-28; source msha-controller-operator-history
- **controller_controls_operator:** Philip F  Werner Jr et al → Werner Construction; 2002-09-03 to 2011-11-28; source msha-controller-operator-history
- **operator_operates_mine:** Werner Construction Inc. → Portable Crusher #4; 2011-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Philip F  Werner Jr et al → Portable Crusher #4; 2011-11-29 to 2025-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Philip F  Werner Jr et al → Werner Construction Inc.; 2011-11-29 to 2025-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Werner → Portable Crusher #4; 2025-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Werner → Werner Construction Inc.; 2025-03-26 to current/open; source msha-controller-operator-history