# Relationship history for MSHA mine 0405668

Current hierarchy: **Jim  Gasparo; Bill  Cooley → Cooley Equipment Corp → Sand 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:** Cooley Equipment Corp → Sand Plant; 2006-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Cooley  et al → Sand Plant; 2006-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Cooley  et al → Cooley Equipment Corp; 2006-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim  Gasparo  et al → Cooley Equipment Corp; 2006-01-03 to current/open; source msha-controller-operator-history