# Relationship history for MSHA mine 3609644

Current hierarchy: **Robert A  Pavelski; Michael M  Pavelski → P.B.S. Bluestone Company → Robinson & Maher**

- 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:** Mike Mills Stone → Robinson & Maher; 2008-07-15 to 2022-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Mike J  Mills → Robinson & Maher; 2008-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike J  Mills → Mike Mills Stone; 2008-07-15 to 2022-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Robert A  Pavelski et al → Robinson & Maher; 2012-10-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** P.B.S. Bluestone Company → Robinson & Maher; 2022-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert A  Pavelski et al → P.B.S. Bluestone Company; 2022-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael M  Pavelski et al → P.B.S. Bluestone Company; 2022-05-16 to current/open; source msha-controller-operator-history