# Relationship history for MSHA mine 2103397

Current hierarchy: **John R.  Kamphake → JJ's Company Excavating LLC → Portable Crusher**

- 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:** JJ's Company Excavating LLC → Portable Crusher; 2003-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John A  Kamphake → Portable Crusher; 2003-10-29 to 2024-05-13; source msha-controller-operator-history
- **controller_controls_operator:** John A  Kamphake → JJ's Company Excavating LLC; 2003-10-29 to 2024-05-13; source msha-controller-operator-history
- **controller_controls_mine:** John R.  Kamphake → Portable Crusher; 2024-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R.  Kamphake → JJ's Company Excavating LLC; 2024-05-14 to current/open; source msha-controller-operator-history