# Relationship history for MSHA mine 5100312

Current hierarchy: **Kenneth  Kobatake → Delta Construction → Mobile Rock Crusher #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:** Kenneth  Kobatake et al → Mobile Rock Crusher #3; 2011-05-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Delta Construction → Mobile Rock Crusher #3; 2015-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Kobatake et al → Delta Construction; 2015-10-13 to current/open; source msha-controller-operator-history