# Relationship history for MSHA mine 3401146

Current hierarchy: **Robert  Dummitt → Dummitt Trucking Service → DUMMITT PIT**

- 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:** Dummitt Trucking Service → DUMMITT PIT; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Dummitt → DUMMITT PIT; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Dummitt → Dummitt Trucking Service; 1978-03-09 to current/open; source msha-controller-operator-history