# Relationship history for MSHA mine 0405158

Current hierarchy: **Peter J  Lemon → Granite Rock Company → Dolomite Materials Branch**

- 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:** Douglas E  Raisch → Dolomite Materials Branch; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bruce W  Woolpert  et al → Dolomite Materials Branch; 1950-01-01 to 2012-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Raisch Products → Dolomite Materials Branch; 1991-09-01 to 1995-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Douglas E  Raisch → Raisch Products; 1991-09-01 to 1995-06-25; source msha-controller-operator-history
- **operator_operates_mine:** Granite Rock Company → Dolomite Materials Branch; 1995-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce W  Woolpert  et al → Granite Rock Company; 1995-06-26 to 2012-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Thomas H  Squeri et al → Dolomite Materials Branch; 2012-07-23 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Thomas H  Squeri et al → Granite Rock Company; 2012-07-23 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Peter J  Lemon → Dolomite Materials Branch; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter J  Lemon → Granite Rock Company; 2023-01-01 to current/open; source msha-controller-operator-history