# Relationship history for MSHA mine 4105281

Current hierarchy: **Gay  Moss; Swan  Moss → SBM Earthmoving → Sandvic QI 441 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Gay  Moss et al → Sandvic QI 441 Crusher; 2013-02-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** SBM Earthmoving → Sandvic QI 441 Crusher; 2017-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gay  Moss et al → SBM Earthmoving; 2017-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Swan  Moss et al → SBM Earthmoving; 2017-09-06 to current/open; source msha-controller-operator-history