# Relationship history for MSHA mine 2901842

Current hierarchy: **Andrew J  Gilbert III → A J Gilbert Construction Company → Gardner 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

- **controller_controls_mine:** Andrew J  Gilbert III → Gardner Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A J Gilbert Construction Company → Gardner Pit; 1980-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew J  Gilbert III → A J Gilbert Construction Company; 1980-10-01 to current/open; source msha-controller-operator-history