# Relationship history for MSHA mine 2600117

Current hierarchy: **Dennis  Sonnenberg → Wilkin Mining & Trucking Inc → MACKIE PERLITE 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

- **operator_operates_mine:** Wilkin Mining & Trucking → MACKIE PERLITE MINE; 1950-01-01 to 1980-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Wilken  et al → MACKIE PERLITE MINE; 1950-01-01 to 1980-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Wilken  et al → Wilkin Mining & Trucking; 1950-01-01 to 1980-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Wilkin Mining & Trucking Inc → MACKIE PERLITE MINE; 1980-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis  Sonnenberg et al → MACKIE PERLITE MINE; 1980-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Sonnenberg et al → Wilkin Mining & Trucking Inc; 1980-08-04 to current/open; source msha-controller-operator-history