# Relationship history for MSHA mine 3607201

Current hierarchy: **Troy  Soberdash → Black Rock Coal Co., Inc. → Kunkle Surface Mine**

- 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:** Darryl M  Jacobs → Kunkle Surface Mine; 1978-08-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Seven Sisters Mining Company Inc → Kunkle Surface Mine; 1981-09-01 to 2006-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Darryl M  Jacobs → Seven Sisters Mining Company Inc; 1981-09-01 to 2006-07-27; source msha-controller-operator-history
- **operator_operates_mine:** Black Rock Coal Co., Inc. → Kunkle Surface Mine; 2006-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Troy  Soberdash et al → Kunkle Surface Mine; 2006-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Troy  Soberdash et al → Black Rock Coal Co., Inc.; 2006-07-28 to current/open; source msha-controller-operator-history