# Relationship history for MSHA mine 3609149

Current hierarchy: **Pike Underground Inc → Springbrook Enterprises, Inc. → SPRINGBROOK ENTERPRISES, INC.**

- 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:** Springbrook Enterprises, Inc. → SPRINGBROOK ENTERPRISES, INC.; 2003-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keith E  Mitschele → SPRINGBROOK ENTERPRISES, INC.; 2003-05-29 to 2020-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Keith E  Mitschele → Springbrook Enterprises, Inc.; 2003-05-29 to 2020-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Pike Underground Inc → SPRINGBROOK ENTERPRISES, INC.; 2020-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pike Underground Inc → Springbrook Enterprises, Inc.; 2020-06-29 to current/open; source msha-controller-operator-history