I found this interesting device at The Liberty Tool company this summer. Its purpose and function is not readily apparent but patent 1,990,820 describes it thus: "This invention relates to implements for applying clamps to hose for the usual purpose of securing one hose-section to another or for the attachment of a coupling-member at an end of a hose." The other side of the tool says Stayput Tool Company."
Still not clear to me but the company was based in Denver Colorado. No idea when the business closed but the trademark was listed as expired in 2006.