# Relationship history for MSHA mine 0600797

Current hierarchy: **Daniel  Stoughton → Mountaintop Trucking → Portable Norberg 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

- **controller_controls_mine:** Daniel  Stoughton → Portable Norberg Crusher; 2004-03-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountaintop Trucking → Portable Norberg Crusher; 2016-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel  Stoughton → Mountaintop Trucking; 2016-06-09 to current/open; source msha-controller-operator-history