# Relationship history for MSHA mine 1700587

Current hierarchy: **Jonathan E Shaw; Daniel H Shaw → Shaw Brothers Construction Inc → Pioneer/Portable 2 Unit #412**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Shaw Brothers Construction Inc → Pioneer/Portable 2 Unit #412; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jonathan E Shaw et al → Pioneer/Portable 2 Unit #412; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan E Shaw et al → Shaw Brothers Construction Inc; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel H Shaw Et Al → Shaw Brothers Construction Inc; 1988-06-01 to current/open; source msha-controller-operator-history