# Relationship history for MSHA mine 2501222

Current hierarchy: **Erich K  Tiemann; Robert L  Tiemann → Hard Rock Quarries, LLC. → Barnston Quarry**

- 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:** Fred  Beekman et al → Barnston Quarry; 1983-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tri-County Recycling Inc → Barnston Quarry; 2005-01-10 to 2016-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Beekman et al → Tri-County Recycling Inc; 2005-01-10 to 2016-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Norma  Beekman et al → Tri-County Recycling Inc; 2005-01-10 to 2016-09-29; source msha-controller-operator-history
- **operator_operates_mine:** Rush Creek Quarry #1 → Barnston Quarry; 2016-09-30 to 2019-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Rodney E Beekman et al → Barnston Quarry; 2016-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodney E Beekman et al → Rush Creek Quarry #1; 2016-09-30 to 2019-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Ross A Stepan et al → Rush Creek Quarry #1; 2016-09-30 to 2019-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Roc E Beekman et al → Rush Creek Quarry #1; 2016-09-30 to 2019-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Hard Rock Quarries, LLC. → Barnston Quarry; 2019-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Erich K  Tiemann et al → Barnston Quarry; 2019-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Erich K  Tiemann et al → Hard Rock Quarries, LLC.; 2019-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Tiemann et al → Hard Rock Quarries, LLC.; 2019-05-15 to current/open; source msha-controller-operator-history