# Relationship history for MSHA mine 4103390

Current hierarchy: **Midwest Construction Company & Luhr Brothers Inc → Colaska Production Company → ALLWEATHER SAND PIT**

- 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:** Midwest Construction Company & Luhr Brothers Inc → ALLWEATHER SAND PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joe R  Williams Jr → ALLWEATHER SAND PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Texas Architectural Aggregate Inc → ALLWEATHER SAND PIT; 1986-03-01 to 1988-04-24; source msha-controller-operator-history
- **controller_controls_operator:** Joe R  Williams Jr → Texas Architectural Aggregate Inc; 1986-03-01 to 1988-04-24; source msha-controller-operator-history
- **operator_operates_mine:** Colaska Production Company → ALLWEATHER SAND PIT; 1988-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Midwest Construction Company & Luhr Brothers Inc → Colaska Production Company; 1988-04-25 to current/open; source msha-controller-operator-history