# Relationship history for MSHA mine 4003570

Current hierarchy: **Martin Marietta Materials Inc → Blue Water Industries → Midway Quarry - Tunnel Project**

- 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:** Blue Water Industries Holdings LLC → Midway Quarry - Tunnel Project; 2017-12-29 to 2024-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Blue Water Industries → Midway Quarry - Tunnel Project; 2022-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blue Water Industries Holdings LLC → Blue Water Industries; 2022-04-03 to 2024-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Midway Quarry - Tunnel Project; 2024-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Blue Water Industries; 2024-04-29 to current/open; source msha-controller-operator-history