# Relationship history for MSHA mine 0202294

Current hierarchy: **Jean  Reidhead → Reidhead Sand & Rock Inc → El Jay Portable Crusher**

- 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:** Terrence  Reidhead → El Jay Portable Crusher; 1950-01-01 to 2013-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Reidhead Sand & Rock Inc → El Jay Portable Crusher; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terrence  Reidhead → Reidhead Sand & Rock Inc; 1986-03-01 to 2013-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Jean  Reidhead et al → El Jay Portable Crusher; 2013-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jean  Reidhead et al → Reidhead Sand & Rock Inc; 2013-08-01 to current/open; source msha-controller-operator-history