Letters sent between 1800 and 1820 by people born in a city that has 'main' in it's name

Find all letters that were sent between 1800 and 1820 by people born in a city that has 'main' in it's name.

{
    "form": {
        "filter_698d0069b2cb5": {
            "type_id": 1,
            "source": null,
            "options": {
                "operator": "object_or_sub_or",
                "operator_extra": "1",
                "exclude": ""
            },
            "object_definitions": {
                "163": [
                    {
                        "equality": "><",
                        "value": "1800",
                        "range": "1820"
                    }
                ]
            }
        },
        "filter_698d0083bfb00": {
            "type_id": 4,
            "source": {
                "filter_code": "filter_698d0069b2cb5",
                "filter_type_id": 1,
                "filter_beacon": "",
                "type_id": 1,
                "object_description_id": 161,
                "object_sub_details_id": 0,
                "object_sub_description_id": 0,
                "direction": "out"
            },
            "options": {
                "operator": "object_or_sub_or",
                "operator_extra": "1",
                "exclude": ""
            },
            "object_subs": {
                "5": {
                    "object_sub_locations": [
                        {
                            "object_sub_location_type": "reference",
                            "object_sub_location_ref_type_id": 5,
                            "object_sub_location_ref_object_sub_details_id": 57,
                            "object_sub_location_reference": {
                                "beacon": "beacon_698d008a3f3b8"
                            }
                        }
                    ]
                }
            }
        },
        "filter_698d008d9b296": {
            "type_id": 5,
            "source": {
                "filter_code": "filter_698d0083bfb00",
                "filter_type_id": 4,
                "filter_beacon": "beacon_698d008a3f3b8",
                "type_id": 4,
                "object_description_id": 0,
                "object_sub_details_id": 5,
                "object_sub_description_id": "location",
                "direction": "out"
            },
            "options": {
                "operator": "object_or_sub_or",
                "operator_extra": "1",
                "exclude": ""
            },
            "object_name": [
                {
                    "equality": "*",
                    "value": "Main"
                }
            ]
        }
    }
}

Projects

This section describes a number of nodegoat projects. All data of each project can be downloaded via the linked data publication. Every project has their own API endpoint that is described by an OpenAPI Description, e.g. https://demo.nodegoat.io/project/1.openapi. Each project specific API provides access to the model and the data of the project. The complete model can be accessed by the following request: https://demo.nodegoat.io/project/[PROJECT-ID]/model/type/, e.g. https://demo.nodegoat.io/project/1/model/type/. The data can be accessed per Object Type: https://demo.nodegoat.io/project/[PROJECT-ID]/data/type/[OBJECT-TYPE-ID]/object, e.g. https://demo.nodegoat.io/project/1/data/type/4/object. The listed filters can be used in the GUI as well as in API requests. Every filter is a natural language description followed by a JSON notation of the filter used for the query.