# Relationship history for MSHA mine 4103300

Current hierarchy: **T E  Norton Jr → Concord Materials → Cresson Plant**

- 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

- **operator_operates_mine:** Associated Crushed Stone → Cresson Plant; 1985-04-01 to 1986-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Bryant Bobby → Cresson Plant; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryant Bobby → Associated Crushed Stone; 1985-04-01 to 1986-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Associated Crushed Stone → Cresson Plant; 1986-10-15 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Chico Crushed Stone Inc → Cresson Plant; 1986-10-15 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Chico Crushed Stone Inc → Associated Crushed Stone; 1986-10-15 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd  et al → Cresson Plant; 1989-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Chico Crushed Stone Partnership → Cresson Plant; 1989-10-01 to 1991-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd  et al → Chico Crushed Stone Partnership; 1989-10-01 to 1991-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge Corp et al → Chico Crushed Stone Partnership; 1989-10-01 to 1991-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Concord Materials → Cresson Plant; 1991-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** T E  Norton Jr → Cresson Plant; 1991-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T E  Norton Jr → Concord Materials; 1991-02-15 to current/open; source msha-controller-operator-history