# Relationship history for MSHA mine 4103937

Current hierarchy: **Gary  Anders → Leward Anders & Sons Inc → BLANKENBURG 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:** Leward Anders & Sons Inc → BLANKENBURG PIT; 1996-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Anders → BLANKENBURG PIT; 1996-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Anders → Leward Anders & Sons Inc; 1996-11-01 to current/open; source msha-controller-operator-history