# Relationship history for MSHA mine 1700412

Current hierarchy: **Michael S  White → White Brothers Inc → PORTABLE SCREEN UNIT#1(CO,NO.212**

- 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:** White Brothers Inc → PORTABLE SCREEN UNIT#1(CO,NO.212; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael S  White → PORTABLE SCREEN UNIT#1(CO,NO.212; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael S  White → White Brothers Inc; 1950-01-01 to current/open; source msha-controller-operator-history