# Relationship history for MSHA mine 2200705

Current hierarchy: **Michael A  Bush → Bush Construction Company Inc → MCMURRY P.T.**

- 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:** Michael A  Bush  et al → MCMURRY P.T.; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bush Construction Company Inc → MCMURRY P.T.; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael A  Bush  et al → Bush Construction Company Inc; 1999-01-01 to current/open; source msha-controller-operator-history