# Relationship history for MSHA mine 4703423

Current hierarchy: **Kurt  Bechthold → Northeast Asphalt Inc → PW-13**

- 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:** Mark  Teunissen → PW-13; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kurt  Bechthold et al → PW-13; 1988-10-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kiel Sand & Gravel Inc → PW-13; 2005-05-27 to 2024-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Teunissen → Kiel Sand & Gravel Inc; 2005-05-27 to 2024-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Northeast Asphalt Inc → PW-13; 2024-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kurt  Bechthold et al → Northeast Asphalt Inc; 2024-06-01 to current/open; source msha-controller-operator-history