# Relationship history for MSHA mine 1202047

Current hierarchy: **Kurt A  Jones → Jones & Sons Inc → Plainville Mine**

- 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:** Darrell  Jones → Plainville Mine; 1988-07-11 to 2014-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Porter'S Sand & Gravel → Plainville Mine; 1989-01-01 to 1990-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Warren D Porter → Plainville Mine; 1989-01-01 to 1990-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Warren D Porter → Porter'S Sand & Gravel; 1989-01-01 to 1990-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Jones & Sons Inc → Plainville Mine; 1990-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Jones → Jones & Sons Inc; 1990-02-16 to 2014-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Kurt A  Jones → Plainville Mine; 2014-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kurt A  Jones → Jones & Sons Inc; 2014-03-21 to current/open; source msha-controller-operator-history