# Relationship history for MSHA mine 3003008

Current hierarchy: **Tetra Tech Inc → Delaney Development Inc → POWERSCREEN CHIEFTAIN PORTABLE**

- 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:** Delaney Development Inc → POWERSCREEN CHIEFTAIN PORTABLE; 1991-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timothy  Delaney → POWERSCREEN CHIEFTAIN PORTABLE; 1991-05-01 to 2007-04-12; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Delaney → Delaney Development Inc; 1991-05-01 to 2007-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Tetra Tech Inc → POWERSCREEN CHIEFTAIN PORTABLE; 2007-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tetra Tech Inc → Delaney Development Inc; 2007-04-13 to current/open; source msha-controller-operator-history