# Relationship history for MSHA mine 3301605

Current hierarchy: **Abel Don → Abel Materials Inc → Abel Materials**

- 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:** Lash Trucking Service → Abel Materials; 1950-01-01 to 1978-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Lash Trucking Service → Abel Materials; 1950-01-01 to 1978-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Lash Trucking Service → Lash Trucking Service; 1950-01-01 to 1978-07-25; source msha-controller-operator-history
- **operator_operates_mine:** Abel Materials Inc → Abel Materials; 1978-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Abel Don → Abel Materials; 1978-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Abel Don → Abel Materials Inc; 1978-07-26 to current/open; source msha-controller-operator-history