Show inaugurates inaugurated ates new marker system V V 4 2 8 s 4 1 1 this odd looking tower surmounting a service station near the municipal airport at cleveland ohio Is the first of a proposed matlou wide system of markers for air pilots and motorists symbols on the tower sides Ind indicate leate the position on a special map letters signify degrees of latitude and longitude and figures minutes of latitude and longitude ludo L zimmer a map maker Is the inventor of the tower system and grid method of marking maps |