# Relationship history for MSHA mine 3606094

Current hierarchy: **Stahlman Eric-Tim Keighley-Gary Miller → Elbe Construction Company → Elbe Strip**

- 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:** Elbe Construction Company → Elbe Strip; 1976-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stahlman Eric-Tim Keighley-Gary Miller Et Al → Elbe Strip; 1976-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stahlman Eric-Tim Keighley-Gary Miller Et Al → Elbe Construction Company; 1976-04-01 to current/open; source msha-controller-operator-history