Farm truck garden, dairy, nursery or greenhouse and all other customary incidental agricultural occupations are permissible, such as, without thereby limiting the generality of the foregoing, the housing of livestock regularly maintained on such farm, farm equipment and crops or supplies; the making of cider; the bottling of milk and cream produced on the premises from livestock on such farm when approved by the County Department of Health; the cold storage of farm produce produced upon said farm, together with the use of structures for these and similar purposes, provided that any structure so used shall not be within 75 feet of a public road line or nearer than 25 feet from any other property line.