# Relationship history for MSHA mine 2801028

Current hierarchy: **Jennifer  Clayton; William R  Clayton II → Clayton's Masonry Unit LLC → Landing Quarry**

- 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:** Clayton's Masonry Unit LLC → Landing Quarry; 2009-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jennifer  Clayton et al → Landing Quarry; 2009-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jennifer  Clayton et al → Clayton's Masonry Unit LLC; 2009-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William R  Clayton II et al → Clayton's Masonry Unit LLC; 2009-08-31 to current/open; source msha-controller-operator-history