# Relationship history for MSHA mine 1300175

Current hierarchy: **Michael  Deutmeyer → Weber Stone Company Inc → WEBER ROVING 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:** Alpha Crushed Stone Inc → WEBER ROVING PLANT; 1950-01-01 to 1981-03-18; source msha-controller-operator-history
- **controller_controls_mine:** B W  Carpenter  et al → WEBER ROVING PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B W  Carpenter  et al → Alpha Crushed Stone Inc; 1950-01-01 to 1981-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Deutmeyer → WEBER ROVING PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Weber Stone Company Inc → WEBER ROVING PLANT; 1981-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Deutmeyer → Weber Stone Company Inc; 1981-03-19 to current/open; source msha-controller-operator-history