# Relationship history for MSHA mine 3607011

Current hierarchy: **Donald F  Mauthe → M S M Coal Co., Inc. → Sandy Flat**

- 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:** Donald F  Mauthe → Sandy Flat; 1977-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M S M Coal Company Inc → Sandy Flat; 1980-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald F  Mauthe → M S M Coal Company Inc; 1980-08-01 to current/open; source msha-controller-operator-history