# Relationship history for MSHA mine 1001905

Current hierarchy: **Lance S Thueson; Janel  Thueson → River Rock Sand & Gravel, LLC → Portable Crusher #2 (45)**

- 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:** Michael R  Smith  et al → Portable Crusher #2 (45); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** G & B Redi-Mix → Portable Crusher #2 (45); 1994-05-01 to 2005-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Michael R  Smith  et al → G & B Redi-Mix; 1994-05-01 to 2005-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Tamara J  De Boer  et al → G & B Redi-Mix; 1994-05-01 to 2005-10-31; source msha-controller-operator-history
- **operator_operates_mine:** River Rock Sand & Gravel, LLC → Portable Crusher #2 (45); 2005-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lance S Thueson et al → Portable Crusher #2 (45); 2005-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lance S Thueson et al → River Rock Sand & Gravel, LLC; 2005-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Janel  Thueson et al → River Rock Sand & Gravel, LLC; 2005-11-01 to current/open; source msha-controller-operator-history