# Relationship history for MSHA mine 4703649

Current hierarchy: **James L  Hoffman → Hoffman Construction Company → Dovre Mine Site**

- 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

- **controller_controls_mine:** CRS Proppants → Dovre Mine Site; 2012-04-25 to 2014-10-16; source msha-controller-operator-history
- **operator_operates_mine:** Great Northern Sand → Dovre Mine Site; 2012-05-03 to 2013-05-31; source msha-controller-operator-history
- **controller_controls_operator:** CRS Proppants → Great Northern Sand; 2012-05-03 to 2013-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Hoffman Construction Company → Dovre Mine Site; 2013-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James L  Hoffman et al → Dovre Mine Site; 2013-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L  Hoffman et al → Hoffman Construction Company; 2013-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eagle Materials Inc → Dovre Mine Site; 2014-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eagle Materials Inc → Great Northern Sand; 2014-10-17 to 2013-05-31; source msha-controller-operator-history