# Relationship history for MSHA mine 1900322

Current hierarchy: **James O Lynch → Lynch Materials → Lynch Materials**

- 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:** J J Cronin Company → Lynch Materials; 1950-01-01 to 1986-02-18; source msha-controller-operator-history
- **controller_controls_mine:** Jeremiah B  Cronin  et al → Lynch Materials; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeremiah B  Cronin  et al → J J Cronin Company; 1950-01-01 to 1986-02-18; source msha-controller-operator-history
- **controller_controls_operator:** John J  Cronin  et al → J J Cronin Company; 1950-01-01 to 1986-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Heffron Materials-Div/Heffron Asphalt Corp → Lynch Materials; 1986-02-19 to 2016-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth  Heffron → Lynch Materials; 1986-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Heffron → Heffron Materials-Div/Heffron Asphalt Corp; 1986-02-19 to 2016-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Lynch Materials → Lynch Materials; 2016-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James O Lynch → Lynch Materials; 2016-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James O Lynch → Lynch Materials; 2016-03-25 to current/open; source msha-controller-operator-history