# Relationship history for MSHA mine 3700181

Current hierarchy: **Stephen P  Lynch Jr; David C  Lynch Sr → Tiverton Materials → Tiverton 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:** Construction Materials Corporation → Tiverton Materials; 1987-02-01 to 2013-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey A  Douglass  et al → Tiverton Materials; 1987-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey A  Douglass  et al → Construction Materials Corporation; 1987-02-01 to 2013-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Tiverton Materials → Tiverton Materials; 2013-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David C  Lynch Sr et al → Tiverton Materials; 2013-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David C  Lynch Sr et al → Tiverton Materials; 2013-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen P  Lynch Jr et al → Tiverton Materials; 2013-05-15 to current/open; source msha-controller-operator-history