Notice that phone numbers are now a mix of 5,6,and 7 digit numbers. Exchanges like GL - glendale, or 45 - and CH - cherry, or 24 - signified that the area around Godwin had grown significantly by 1950, and that mroe phone numbers were need than 5 and even 6 digits could supply. Intended to help people remember numbers, the poetic exhange names are now but a memory, and with the proliferation of area codes, people are now expected to deal with 10 digit numbers. Fortunately, most telephones now store names and phone numbers.