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Amgueddfa Cymru – Museum Wales
Holman Bros.Ltd., Camborne, England. Thiteen printed cards showing drawings, specification details and parts list: includes cards for the Holman "SS 22" Road Ripper spring retainer type; the "S.L. 250" hand-feed streamline drifter throttle-blowing collared steel type; Atlas Diesel rock drill; Holman "S.L.9" Handril wet type; Holman "Super 8" pneumatic ripper; Holman "620" rotopump sump type; Holman Rotogrinds extension type series 200; Holman Size 18 pneumatic pick; Holman pneumatic bush hammer; Holman "ER" type riveting hammers; Holman silverbullet stopper.
