# Relationship history for MSHA mine 3003677

Current hierarchy: **Maria A.  Pedra; Verissimo  Pedra → P.E.M. Island Materials Corp. → Wilshire Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** P.E.M. Island Materials Corp. → Wilshire Sand & Gravel; 2009-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Maria A.  Pedra et al → Wilshire Sand & Gravel; 2009-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Maria A.  Pedra et al → P.E.M. Island Materials Corp.; 2009-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Verissimo  Pedra et al → P.E.M. Island Materials Corp.; 2009-05-06 to current/open; source msha-controller-operator-history