# Relationship history for MSHA mine 5100290

Current hierarchy: **William  Loeffler → William C. Loeffler Construction, Inc. → Portable Telsmith Crusher**

- 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

- **operator_operates_mine:** William C. Loeffler Construction, Inc. → Portable Telsmith Crusher; 2008-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Loeffler → Portable Telsmith Crusher; 2008-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Loeffler → William C. Loeffler Construction, Inc.; 2008-02-06 to current/open; source msha-controller-operator-history