# Relationship history for MSHA mine 0600605

Current hierarchy: **Kathleen A  Holden → Herb Holden Trucking Inc → PowerScreen Warrior 1800**

- 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:** Herb Holden Trucking Inc → PowerScreen Warrior 1800; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Herbert W  Holden → PowerScreen Warrior 1800; 1985-04-01 to 2019-12-25; source msha-controller-operator-history
- **controller_controls_operator:** Herbert W  Holden → Herb Holden Trucking Inc; 1985-04-01 to 2019-12-25; source msha-controller-operator-history
- **controller_controls_mine:** Kathleen A  Holden → PowerScreen Warrior 1800; 2019-12-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kathleen A  Holden → Herb Holden Trucking Inc; 2019-12-26 to current/open; source msha-controller-operator-history