# Relationship history for MSHA mine 0201845

Current hierarchy: **Fritsch Thomas-Doreen → Thompson Ready Mix Inc → T R M Incorporated**

- 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:** Thompson Redi-Mix Company → T R M Incorporated; 1950-01-01 to 1986-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Thompson Dean → T R M Incorporated; 1950-01-01 to 1986-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Dean → Thompson Redi-Mix Company; 1950-01-01 to 1986-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Thompson Ready Mix Inc → T R M Incorporated; 1986-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fritsch Thomas-Doreen Et Al → T R M Incorporated; 1986-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fritsch Thomas-Doreen Et Al → Thompson Ready Mix Inc; 1986-05-14 to current/open; source msha-controller-operator-history