# Relationship history for MSHA mine 4100308

Current hierarchy: **Frank  Shemanski → Mid-Tex Minerals Inc → Flatonia Mines & Plant**

- 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:** Milwhite Inc → Flatonia Mines & Plant; 1950-01-01 to 1992-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Milwhite Inc → Flatonia Mines & Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Milwhite Inc → Milwhite Inc; 1950-01-01 to 1992-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Tex Minerals Inc → Flatonia Mines & Plant; 1992-07-17 to 1995-10-19; source msha-controller-operator-history
- **controller_controls_mine:** Ronald E  Steinhauser → Flatonia Mines & Plant; 1992-07-17 to 1995-10-19; source msha-controller-operator-history
- **controller_controls_operator:** Ronald E  Steinhauser → Mid-Tex Minerals Inc; 1992-07-17 to 1995-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Tex Minerals Inc → Flatonia Mines & Plant; 1995-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frank  Shemanski → Flatonia Mines & Plant; 1995-10-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Shemanski → Mid-Tex Minerals Inc; 1995-10-20 to current/open; source msha-controller-operator-history