# Relationship history for MSHA mine 3605125

Current hierarchy: **Gene B  Gangloff → Hecla Machinery & Equipment Company → B D Silt Bank**

- 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:** Gene B  Gangloff → B D Silt Bank; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hecla Machinery & Equipment Company → B D Silt Bank; 1974-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gene B  Gangloff → Hecla Machinery & Equipment Company; 1974-07-22 to current/open; source msha-controller-operator-history