# Relationship history for MSHA mine 0404934

Current hierarchy: **Martin David B → Dave Martin Supplies Inc → Hester Granite 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:** Martin David B → Hester Granite Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dave Martin Supplies Inc → Hester Granite Pit; 1988-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin David B → Dave Martin Supplies Inc; 1988-04-01 to current/open; source msha-controller-operator-history