# Relationship history for MSHA mine 2102975

Current hierarchy: **Carroll W  Domek → County Line Contractors Inc → Port. Crusher #1**

- 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:** Tow Brothers Construction Inc → Port. Crusher #1; 1988-06-01 to 1999-04-19; source msha-controller-operator-history
- **controller_controls_mine:** James R  Tow → Port. Crusher #1; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Tow → Tow Brothers Construction Inc; 1988-06-01 to 1999-04-19; source msha-controller-operator-history
- **operator_operates_mine:** County Line Contractors Inc → Port. Crusher #1; 1999-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carroll W  Domek  et al → Port. Crusher #1; 1999-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carroll W  Domek  et al → County Line Contractors Inc; 1999-04-20 to current/open; source msha-controller-operator-history