# Relationship history for MSHA mine 4503740

Current hierarchy: **Martin  Ruiter → Martin's Feed Inc → Portable 2**

- 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:** Martin  Ruiter → Portable 2; 2013-08-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Martin's Feed Inc → Portable 2; 2015-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin  Ruiter → Martin's Feed Inc; 2015-08-31 to current/open; source msha-controller-operator-history