IMPROVED AUTOMATIC STEP LADDER. MACNIDER'S IMPROVED AUTOMATIC STEP LADDER. 1 1. IMPROVED DOOR CHECK. IMPROVED WHEEL CULTIVATOR. CHEESE CUTTER. back edge of the platform then up the back edge HODGEN'S CHEESE CUTTER. COMPRESSED AIR GREASE CUP. HINKLE & JEFFERY'S IMPROVED DOOR CHECK. SCHWALLER'S IMPROVED WHEEL CULTIVATOR., scientific american, 1887-01-22

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