# Relationship history for MSHA mine 0500434

Current hierarchy: **Joseph C  Welte → Mayne Block & Stone Company → Block 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Dotsero Block Inc → Block Plant; 1950-01-01 to 1984-06-30; source msha-controller-operator-history
- **controller_controls_mine:** George E  Morrison → Block Plant; 1950-01-01 to 1984-06-30; source msha-controller-operator-history
- **controller_controls_operator:** George E  Morrison → Dotsero Block Inc; 1950-01-01 to 1984-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Dotsero Block Inc → Block Plant; 1984-07-01 to 1991-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Whitman → Block Plant; 1984-07-01 to 1991-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Whitman → Dotsero Block Inc; 1984-07-01 to 1991-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Mayne Industries → Block Plant; 1991-10-15 to 2010-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Krista  Mayne et al → Block Plant; 1991-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Krista  Mayne et al → Mayne Industries; 1991-10-15 to 2010-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Gerry A  Mayne et al → Mayne Industries; 1991-10-15 to 2010-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Mayne Block & Stone Company → Block Plant; 2010-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joseph C  Welte et al → Block Plant; 2010-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph C  Welte et al → Mayne Block & Stone Company; 2010-07-16 to current/open; source msha-controller-operator-history