Technical supply co., Scranton. [from old catalog] · Scranton, Pa., Technical supply co · leaf 373
f^ RECORDING INSTRUMENTS … 4325 These self-recording instruments have been adopted by the UnitedStates Weather Bureau and are warranted reliable and correct. The vitalparts of the instrument expand or contract under varjing conditions of theatmosphere and impart motion to a multiplying lever, to one end ofwhich a pen is…
Engineering instruments · Drawing instruments
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