# Relationship history for MSHA mine 4104350

Current hierarchy: **Robert W  Keeland → Keemac Sand and Gravel Company  LP → Keemac No 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** A & W Sand & Gravel → Keemac No 1; 2002-03-27 to 2002-11-18; source msha-controller-operator-history
- **controller_controls_mine:** John  Arnold → Keemac No 1; 2002-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Arnold → A & W Sand & Gravel; 2002-03-27 to 2002-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Weaver  Wiggens → A & W Sand & Gravel; 2002-03-27 to 2002-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Keemac Sand and Gravel Co.  LP → Keemac No 1; 2002-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert W  Keeland et al → Keemac No 1; 2002-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Keeland et al → Keemac Sand and Gravel Co.  LP; 2002-11-19 to current/open; source msha-controller-operator-history