# Relationship history for MSHA mine 1700530

Current hierarchy: **Kurt D  Hissong → R H Brown → KENNEBUNKPORT MILL**

- 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:** Robert H Brown Inc → KENNEBUNKPORT MILL; 1981-04-01 to 1986-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Robert H  Brown Jr → KENNEBUNKPORT MILL; 1981-04-01 to 1986-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Robert H  Brown Jr → Robert H Brown Inc; 1981-04-01 to 1986-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Robert H Brown Sand & Gravel Inc → KENNEBUNKPORT MILL; 1986-05-05 to 2008-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Stuart C  Giles → KENNEBUNKPORT MILL; 1986-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stuart C  Giles → Robert H Brown Sand & Gravel Inc; 1986-05-05 to 2008-06-02; source msha-controller-operator-history
- **operator_operates_mine:** R H Brown → KENNEBUNKPORT MILL; 2008-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kurt D  Hissong → KENNEBUNKPORT MILL; 2008-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kurt D  Hissong → R H Brown; 2008-06-03 to current/open; source msha-controller-operator-history