# Relationship history for MSHA mine 3001844

Current hierarchy: **Kovacs Alexander J → A J Kovacs Trucking → Eight Bells 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:** A De Luca & Son Inc → Eight Bells Pit; 1950-01-01 to 1979-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Anthony  De Luca → Eight Bells Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anthony  De Luca → A De Luca & Son Inc; 1950-01-01 to 1979-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Bottge Excavators & Materials Inc → Eight Bells Pit; 1979-07-01 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Bottge Otto W → Eight Bells Pit; 1979-07-01 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Bottge Otto W → Bottge Excavators & Materials Inc; 1979-07-01 to 1979-12-31; source msha-controller-operator-history
- **operator_operates_mine:** A J Kovacs Trucking → Eight Bells Pit; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kovacs Alexander J → Eight Bells Pit; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kovacs Alexander J → A J Kovacs Trucking; 1980-01-01 to current/open; source msha-controller-operator-history