# Relationship history for MSHA mine 1001888

Current hierarchy: **Bryan Dale  Wilson → 3BW LLC → C R M PIT #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:** Challis Redi-Mix & Masonry → C R M PIT #1; 1993-06-01 to 2008-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Michael G  Rukavina → C R M PIT #1; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael G  Rukavina → Challis Redi-Mix & Masonry; 1993-06-01 to 2008-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Challis Redi-Mix LLC → C R M PIT #1; 2008-05-01 to 2022-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Frank A  Robinson  et al → C R M PIT #1; 2008-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank A  Robinson  et al → Challis Redi-Mix LLC; 2008-05-01 to 2022-03-22; source msha-controller-operator-history
- **operator_operates_mine:** 3BW LLC → C R M PIT #1; 2022-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bryan Dale  Wilson → C R M PIT #1; 2022-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryan Dale  Wilson → 3BW LLC; 2022-03-23 to current/open; source msha-controller-operator-history