# Relationship history for MSHA mine 3003363

Current hierarchy: **Tetra Tech Inc → Delaney Crushed Stone Products Inc → Power Screen Commander**

- 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

- **controller_controls_mine:** Timothy  Delaney → Power Screen Commander; 1991-05-01 to 2007-04-12; source msha-controller-operator-history
- **operator_operates_mine:** Delaney Crushed Stone Products Inc → Power Screen Commander; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Delaney → Delaney Crushed Stone Products Inc; 2001-05-01 to 2007-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Tetra Tech Inc → Power Screen Commander; 2007-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tetra Tech Inc → Delaney Crushed Stone Products Inc; 2007-04-13 to current/open; source msha-controller-operator-history