# Relationship history for MSHA mine 2003665

Current hierarchy: **Waterford Stone LLC → Stone Material Handling LP → SMH Portable**

- 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:** Stone Material Handling LP → SMH Portable; 2023-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Waterford Stone LLC → SMH Portable; 2023-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Waterford Stone LLC → Stone Material Handling LP; 2023-12-08 to current/open; source msha-controller-operator-history