# Relationship history for MSHA mine 0405760

Current hierarchy: **Robert  Jones → Ford Construction Company Inc → Portable Plant #3**

- 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:** Robert  Jones → Portable Plant #3; 2008-07-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ford Construction Company Inc → Portable Plant #3; 2008-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Jones → Ford Construction Company Inc; 2008-07-09 to current/open; source msha-controller-operator-history