# Relationship history for MSHA mine 4702646

Current hierarchy: **Mathy Construction Company → Milestone Materials Div/Mathy Construction Co → Plant #34**

- 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:** Adolph T Schwartz → Plant #34; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mathy Construction Company → Plant #34; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arthur Overgaard Inc → Plant #34; 1980-01-01 to 1989-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Adolph T Schwartz → Arthur Overgaard Inc; 1980-01-01 to 1989-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Milestone Materials Div/Mathy Construction Co → Plant #34; 1989-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mathy Construction Company → Milestone Materials Div/Mathy Construction Co; 1989-09-28 to current/open; source msha-controller-operator-history