# Relationship history for MSHA mine 1700409

Current hierarchy: **Larry  Rowe → Rowe Construction → PORTABLE PLANT**

- 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:** Douglas H Whitney → PORTABLE PLANT; 1950-01-01 to 1984-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Douglas H  Whitney → PORTABLE PLANT; 1950-01-01 to 1984-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Douglas H  Whitney → Douglas H Whitney; 1950-01-01 to 1984-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Rowe Construction → PORTABLE PLANT; 1984-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Rowe → PORTABLE PLANT; 1984-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Rowe → Rowe Construction; 1984-05-18 to current/open; source msha-controller-operator-history