Handbooks. 28. Screw-thread standards for Federal services, 1957: pt. 3, Acme, stub acme. and buttress threads, rolled threads for screw shells of electric lamp holders and unassembled lamp bases, microscope objective and noseplece threads, surveying instrument mounting threads, photographic equipment threads, ISO metric threads, miscellaneous threads, class 5 interference-lit threads, trial standard, wrench openings.

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