# Relationship history for MSHA mine 4703305

Current hierarchy: **Mathy Construction Company → Milestone Materials Div/Mathy Construction Co → Plant #75**

- 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:** Mathy Construction Company → Plant #75; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William J  Kraemer et al → Plant #75; 1996-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** The Kraemer Company, LLC → Plant #75; 2002-05-07 to 2020-12-21; source msha-controller-operator-history
- **controller_controls_operator:** William J  Kraemer et al → The Kraemer Company, LLC; 2002-05-07 to 2020-12-21; source msha-controller-operator-history
- **operator_operates_mine:** Milestone Materials Div/Mathy Construction Co → Plant #75; 2020-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mathy Construction Company → Milestone Materials Div/Mathy Construction Co; 2020-12-22 to current/open; source msha-controller-operator-history