# Relationship history for MSHA mine 3609174

Current hierarchy: **Devin  Hollenbeck → DH Manufacturing LLC → #4 North**

- 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:** Mahlon A. Winkleblech → #4 North; 2003-10-23 to 2018-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Mahlon A  Winkleblech → #4 North; 2003-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mahlon A  Winkleblech → Mahlon A. Winkleblech; 2003-10-23 to 2018-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Catlin Hill Stone, Inc. → #4 North; 2018-10-01 to 2020-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Chad H  Hollenbeck et al → #4 North; 2018-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad H  Hollenbeck et al → Catlin Hill Stone, Inc.; 2018-10-01 to 2020-12-18; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Adams et al → Catlin Hill Stone, Inc.; 2018-10-01 to 2020-12-18; source msha-controller-operator-history
- **controller_controls_mine:** Devin  Hollenbeck → #4 North; 2020-11-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** DH Manufacturing LLC → #4 North; 2020-12-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Devin  Hollenbeck → DH Manufacturing LLC; 2020-12-19 to current/open; source msha-controller-operator-history