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US Patent: 1,243,010
Valve Spring Lifter
Perfect Handle Valve Lifter
William S. Thomson - Plantsville, CT

USPTO Classifications:

Tool Categories:
specialty tools : valve spring tools
specialty tools : automotive tools

H. D. Smith and Company - Plantsville, CT

H. D. Smith and Company - Plantsville, CT

R. W. Edwards
H. C. Kingsley
E. H. Galpin
G. R. Bond

Patent Dates:
Applied: Feb. 04, 1915
Granted: Oct. 16, 1917

Patent Pictures:
William S. Thomson patent October 16, 1917, with PERFECT HANDLE valve lifter - photo courtesy Martin J. Donnelly - mjdtools.com
USPTO pdf tiff
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A chain and hook type valve spring compressor, with the distinctive "Perfect Handle" styling. The specifications reference Lucius V. Walkley's July 8, 1913 design patent D44,327.

Most often found without the chain and hook as is typical of tools of this type.

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