# Relationship history for MSHA mine 5001178

Current hierarchy: **Berg Construction Company → Berg Construction Company → 6 Mile Zimovia Highway Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Hardrock Construction Company → 6 Mile Zimovia Highway Quarry; 1950-01-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Ray  Perin → 6 Mile Zimovia Highway Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray  Perin → Hardrock Construction Company; 1950-01-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Stough James → 6 Mile Zimovia Highway Quarry; 1979-01-01 to 1980-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Kadin Corp → 6 Mile Zimovia Highway Quarry; 1980-04-01 to 1980-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Stough James → Kadin Corp; 1980-04-01 to 1980-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Berg Construction Company → 6 Mile Zimovia Highway Quarry; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Berg Construction Company → 6 Mile Zimovia Highway Quarry; 1980-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Berg Construction Company → Berg Construction Company; 1980-05-01 to current/open; source msha-controller-operator-history