1930 76 229 The boring kit was a 4-inch post-hole borer of a very efficient pattern.
1950 June 553/3 Holes may be dug with a spade, sunk with a post-hole borer, or cored with a soil sampler.
1970 18 Apr. (Sat. Review) p. vi./1 (advt.) Dig deep in seconds! Post-hole borer. Make a clear cut hole up to 3ft. deep by 8in. dia. in about 60 seconds.