# Relationship history for MSHA mine 3608706

Current hierarchy: **Deitz Robert → Deitz Brothers Coal Company → Deitz Bros Coal Co**

- 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:** S & H Anthracite Coal Company → Deitz Bros Coal Co; 1997-12-01 to 1998-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Smith Howard & John Hogan → Deitz Bros Coal Co; 1997-12-01 to 1998-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Smith Howard & John Hogan → S & H Anthracite Coal Company; 1997-12-01 to 1998-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Deitz Brothers Coal Company → Deitz Bros Coal Co; 1998-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deitz Robert Et Al → Deitz Bros Coal Co; 1998-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deitz Robert Et Al → Deitz Brothers Coal Company; 1998-08-05 to current/open; source msha-controller-operator-history