# Relationship history for MSHA mine 1000305

Current hierarchy: **Stanley S  Lafrenz → Lake Pre-Mix Inc → Heath Lake Pit**

- 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:** Bargain Supplies Inc → Heath Lake Pit; 1950-01-01 to 1981-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Daniel  Deshon → Heath Lake Pit; 1950-01-01 to 1981-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Daniel  Deshon → Bargain Supplies Inc; 1950-01-01 to 1981-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Lake Pre-Mix Inc → Heath Lake Pit; 1981-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stanley S  Lafrenz → Heath Lake Pit; 1981-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley S  Lafrenz → Lake Pre-Mix Inc; 1981-08-06 to current/open; source msha-controller-operator-history