I have a recently acquired underlined CRAFTSMAN egg beater drill with A-I on the crank arm & the chuck, a FULTON with the same markings and just saw a DUNLAP on the e place with the same markings and am curious what that marking refers to or means. Since Sears used FULTON & DUNLAP for economy tool lines at one time in addition to their normal CRAFTSMAN line I'm sort of thinking it had to do with a vendor code. Would appreciate any definitive information including time frame used as I'm thinking the underlined CRAFTSMAN was used in the 1940's. Please see attached photos. Thanks.

Charlie(sometimes still a newbie)

Hello, Charlie. There seems to be a lot of info available regarding Craftsman manufacturer codes. It seems that most of the codes apply to wrenches, , or, power tools. I bet there is someone on here that could help you out with the hand tools. Regards, Lou

While cataloging a couple of breast drills lately in noticed each was marked A-I.  They are a Craftsman and a Dunlap.  The design is different for each of them.