# Relationship history for MSHA mine 0405868

Current hierarchy: **Eric W  Peters; Michael T  Peters → Shasta Valley Rock → Silva 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Shasta Valley Rock → Silva Quarry; 2013-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eric W  Peters et al → Silva Quarry; 2013-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eric W  Peters et al → Shasta Valley Rock; 2013-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael T  Peters et al → Shasta Valley Rock; 2013-04-08 to current/open; source msha-controller-operator-history