# Relationship history for MSHA mine 1601122

Current hierarchy: **Jay  McDonald → McDonald Construction → McDonald Construction Inc**

- 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:** Earl Mc Vay & Sons Construction Inc → McDonald Construction Inc; 1987-01-01 to 1999-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Earl  Mc Vay → McDonald Construction Inc; 1987-01-01 to 1999-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Earl  Mc Vay → Earl Mc Vay & Sons Construction Inc; 1987-01-01 to 1999-02-23; source msha-controller-operator-history
- **operator_operates_mine:** McDonald Construction → McDonald Construction Inc; 1999-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jay  McDonald → McDonald Construction Inc; 1999-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jay  McDonald → McDonald Construction; 1999-02-24 to current/open; source msha-controller-operator-history