# Relationship history for MSHA mine 1700237

Current hierarchy: **Jonathan E Shaw; Daniel H Shaw → Shaw Brothers Construction, Inc. → Gray 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:** Portland Sand & Gravel Inc → Gray Pit; 1950-01-01 to 2025-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Anthony R Mancini et al → Gray Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony R Mancini et al → Portland Sand & Gravel Inc; 1950-01-01 to 2025-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Daniel H Shaw Et Al → Gray Pit; 1988-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shaw Brothers Construction, Inc. → Gray Pit; 2025-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel H Shaw Et Al → Shaw Brothers Construction, Inc.; 2025-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan E Shaw et al → Shaw Brothers Construction, Inc.; 2025-03-17 to current/open; source msha-controller-operator-history