# Relationship history for MSHA mine 0405769

Current hierarchy: **International Zeolite Group Inc; Marshall  Pettit → Langley Pacific Resources LLC → Calico Plant**

- 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:** Langley Pacific Resources LLC → Calico Plant; 2008-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marshall  Pettit et al → Calico Plant; 2008-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marshall  Pettit et al → Langley Pacific Resources LLC; 2008-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** International Zeolite Group Inc et al → Langley Pacific Resources LLC; 2008-11-17 to current/open; source msha-controller-operator-history