| 1931 SNAVELY Method Measuring Time Intervals Art |
| 1931 PAUL Clock Frame Method Making Same Art |
| 1931 RUDOLPH Method Of Sewing Felt Hats Patent |
| 1931 PEDERSEN Method Forming Ammunition Clips |
| 1931 MCLEOD Golf Tee Method Manufacturing Patent 47452 |
| 1931 MILLMAN Method For Making Bust Supporters |
| 1931 CHRISTIE Golf Ball Method Manufacturing Same |
| 1931 WHITE Method Reducing Sound In Subways Art |
| 1931 CARL L WRIGHT Boat Seam Sealing Method Art |
| 1931 LAUTER HUMANO CO Piano Case Method Making Same |
| 1931 TRICO PRODUCTS CORP Method Producing Sound |
| 1931 EMILE Method Absorbing Shocks Art Print |
| 1931 WATERS Method Means Producing Pipe Organ Music |
| 1931 CHAMBERS Method Of Loading Wrapped Pipe Art |
| 1931 TURNER Method Of Treating Ice Patent Print |
| 1931 POVALSKI Identification Plate Method Making Same |
| 1931 MCLEOD Golf Tee Method Manufacturing Same |
| 1931 JACOB Method Determining Center Gravity Ships |
| 1931 FLEISCHER Method Films INKWELL FLIMS Patent 20193 |
| 1931 DE Boat Seam Sealing Method Patent Print |
| 1931 WISEMAN Method Fabricating Contra Propellers |
| 1931 Method Constructing Leg Covering Garments |
| 1931 HENRY Method Producing Sound Art Print |
| 1931 WEIS Machine Method Forming French Felled Seams |
| 1931 WILLIAM Rug Method Making Same Art Print |
| 1931 DELTOX RUG Rug Method Making Same Art |
| 1931 GEORG Method Explosive Member Blasting Blast Holes |
| 1931 ELECTRIC STEEL FOUNDRY Method Moving Material |
| 1931 CAMERON Piano Case Method Making Same Art |
| 1931 GUSTAV Cartridge Shell Method Making Same |
| 1931 GEN PAINT CORP Method Loading Wrapped Pipe |
| 1931 COMPO Outer Sole Method Preparing Same Art |
| 1931 HERBERT Method Moving Material Art Print |
| 1931 ROMINE Method Shipping Metal Art Print |
| 1931 ROBERT Method Recording Series Motion Art |
| 1931 LAWRENCE Transfer Method KAUMAGRAPH Patent 45212 |
| 1931 RIVIERE Tufted Fabric Method Making Same |
| 1931 OLMSTEAD Method Loading Bombs Art Print |
| 1931 UNION Method Measuring Time Intervals Art |
| 1931 TURNER Method Means Watch Regulation Art |
| 1931 WESTERN Method Driving Tuning Forks Art |
| 1931 GAY Method Means Propelling Ships Art Print |
| 1931 CONN LTD C G Clarinet Method Manufacture Thereof |
| 1931 JOSEPH Machine Method Making Continuous Cushions |
| 1931 MCBRIDE Method Of Shell Construction Patent |
| 1931 BRESNAHAN Outer Sole Method Preparing Same |
| 1931 UNION Tufted Fabric Method Making Same Art |
| 1931 NAT Machine Method Making Continuous Cushions |
| 1931 ALLEN Metal Arrow Method Making Same Art |
| 1931 SINGER CO Method Sewing Felt Hats Art Print |
| 1931 GULICK Clarinet Method Manufacture Thereof |
| 1931 SUBMARINE SIGNAL CO Method Means Watch Regulation |
| 1931 MARCO Submarine Mine Method Anchoring Same |